Yuta Kubo

In September 2016, Kubo was detained and arrested by the Tokyo Metropolitan Police Department on allegations of assault causing bodily harm raised by his then-wife. According to his ex-wife's testimony, she was verbally and physically assaulted by Kubo, who was upset over a failed stock investment. Kubo punched the woman several times in the head, causing eardrum rupture in both of her ears, which left long-term residual effects in one of the ears. After divorcing, the two reached an out-of-court settlement, which obliged Kubo to pay his wife an undisclosed amount in damages, but spared him from being prosecuted by the Public Prosecutors Office.{{cite web |title=原因は株の収益2億円？ 民事訴訟で暴露された「久保優太」のDV（2ページ目） |url=https://www.dailyshincho.jp/article/2018/01230557/?all=1&page=2 |website=デイリー新潮 |access-date=27 December 2023 |language=ja |date=23 January 2018}}

Yuta Kubo was put practicing taekwondo at age of 8 with his younger brother, Kenji under a Zanichi Korean family friend. He eventually took up kickboxing at the age of 15.{{cite web |title=GBR＞格闘技インタビュー「この人に聞け！」＞久保優太 |url=https://gbring.com/interview/kike-84_1.htm |website=gbring.com |access-date=10 December 2023}}

Kubo made his professional kickboxing debut on January 22, 2005, against Shinji Aseishi as a featherweight (-57.15 kg) at NJKF "Infinite Challenge I", as a high school student. He won the fight by unanimous decision, with all three judges scoring the bout 30–27 in his favor.{{cite web|url=http://www.boutreview.com/data/reports05/050122njkf.html|title=(レポ＆写真) [NJKF] 1.22 後楽園：藤原＆高橋防衛。桜井判定負け}}

Kubo fought three more times over the course of the next six months, amassing a perfect 4–0 record,{{cite web|url=http://www.boutreview.com/data/reports05/050312njkf.html|title=(結果) [NJKF] 3.12 後楽園：童子丸、ラジャダムナン1位に判定勝ち}}{{cite web|url=http://www.boutreview.com/data/reports05/050503njkf.html|title=(レポ＆写真) [NJKF] 5.3 後楽園：笛吹2階級制覇。フェザーは岩井が王者に}} with his final victory over Kozaru at NJKF "Infinite Challenge VII" on July 23, 2005, earning him the #10 spot in the NJKF featherweight rankings.{{cite web|url=http://www.boutreview.com/data/reports05/050723njkf.html|title=(レポ＆写真) [NJKF] 7.23 後楽園：桜井洋平、薄氷防衛。国崇、鬼の復活}} His stoppage wins over the #9 ranked Shōkō on September 24, 2005,{{cite web|url=http://www.boutreview.com/data/reports05/050924njkf.html|title=(レポ) [NJKF] 9.24 後楽園：国崇＆笛吹、タイ強豪の豪打に玉砕}} and the #5 ranked Yoshiaki Takano on November 20, 2005,{{cite web|url=http://www.boutreview.com/data/reports05/051120njkf.html|title=(レポ＆写真) [NJKF] 11.20 後楽園：国崇、真二に判定勝ちで王座防衛}} as well as his unanimous decision triumph over Shōgo Kokubun on March 6, 2006,{{cite web|url=http://www.boutreview.com/data/reports05/060305njkf.html|title=(レポ＆写真) [NJKF] 3.5 後楽園：米田、タイ2冠王から大金星のKO勝利}} earned him the right to face top-ranked Masato Ōkawa in an NJKF featherweight title eliminator, which was held at NJKF "Advance IV" on May 3, 2006. He won the fight by unanimous decision, with scores of 50–47, 50–46 and 50–46.{{cite web|url=http://www.boutreview.com/data/reports05/060503njkf.html|title=(レポ＆写真) [NJKF] 5.3 後楽園：笛吹防衛。米田＆久保が王座挑戦権}}

Kubo was expected to face Yoshinari Nakasuka at "Shinou Hai" on July 22, 2006. He was forced to withdraw from the contest on June 17, as he suffered an injury in training and was sidelined for the next two months.{{cite web |title=GBR＞ニュース＞【NJKF】7・22真王杯 ホープ久保優太の欠場で60kg級対戦カード変更 |url=https://gbring.com/sokuho/news/2006_06/0618_njkf.htm |website=gbring.com |access-date=25 December 2023}} Kubo was replaced by Kōji Okuyama, who stepped in on a month's notice.{{cite web |title=[真王杯] 7.22 後楽園：60kgの久保欠場。中須賀×奥山、砂田×安田に |url=https://www.boutreview.com/data/news05/060722njkf.html |website=www.boutreview.com |access-date=25 December 2023}}

Kubo faced Nichau Sithaikeriangtor in a super featherweight (-60 kg) bout at the Rajadamnern Stadium on September 10, 2006. He won the fight by a third-round knockout. Kubo next faced Kenpeth Shinongchai in an -84 kg catchweight bout on September 16, 2006. He won the fight by a third-round knockout.{{cite web |title=(結果) [NJKF] 9.10,16 タイ：新鋭・久保優太、1週間で2KO勝ち |url=https://www.boutreview.com/data/reports05/060910njkf.html |website=www.boutreview.com |access-date=25 December 2023}}

Kubo was expected to challenge the NJKF featherweight champion Nobuhiro Iwai at "NJKF Shinnou Cup Final" on November 23, 2006.{{cite web |title=[NJKF] 11.23 後楽園：真王杯興行全カード。ヨーユット×砂田他追加 |url=https://www.boutreview.com/data/news05/061123njkf.html |website=www.boutreview.com |access-date=25 December 2023}} Iwai withdrew from the contest on November 1, after suffering an injury in training. Kubo was subsequently promoted to interim champion status.{{cite web |title=[NJKF] 久保優太、フェザー級暫定王者に。岩井の負傷欠場受け |url=https://www.boutreview.com/data/news05/061101njkf-kubo.html |website=www.boutreview.com |access-date=25 December 2023}}

Kubo was expected to face an unnamed Thai opponent in a -59 kg catchweight bout on the "Thai King's Birthday" event on December 5, 2006.{{cite web |title=[ムエタイ] 12.5 タイ：国王生誕記念大会にNJKFの久保優太参戦 |url=https://www.boutreview.com/data/news05/061205muaythai.html |website=www.boutreview.com |access-date=25 December 2023}} His opponent withdrew on the day of the fight and was replaced by Somdet Por.Pantie, with the contest being upgraded to a -90 kg catchweight bout as a result. Kubo won the fight by a fourth-round knockout.{{cite web |title=GBR＞ニュース＞【NJKF】12・5現役大学生の天才キックボクサー久保優太が30kgも重いムエタイをKO！ |url=https://gbring.com/sokuho/news/2006_12/1223_njkf_02.htm |website=gbring.com |access-date=25 December 2023}}

Kubo faced the WMC Hong Kong Super Featherweight champion Daniel in a -58.5 kg catchweight bout at NJKF "Fighting Evolution II -Muay Thai Open-" on January 28, 2007. He won the fight by unanimous decision, with three scorecards of 49–45. Kubo was able to knock his opponent down once, with a left hook, in the second round.{{cite web |title=GBR>試合結果>【NJKF】ムエタイ最高峰センチャイ、芸術技でKO勝利！ 魂叶獅はTKO負け |url=https://gbring.com/sokuho/result/result2007_01/0128_njkf.htm |website=gbring.com |access-date=25 December 2023}}

Kubo faced Nobuhiro Iwai for the undisputed NJKF featherweight championship at NJKF "Fighting Evolution III -3 Kings Champion Carnival-" on March 18, 2007. The pair was originally scheduled to face each other on November 23, before Iwai withdrew with an injury and was therefore stripped of the title, although he was ranked as the #1 contender for the vacant title.{{cite web |title=GBR＞ニュース＞【NJKF】3・18現役大学生イケメンキックボクサー久保優太にインタビュー |url=https://gbring.com/sokuho/news/2007_03/0317_njkf.htm |website=gbring.com |access-date=25 December 2023}} Kubo won the fight by a second-round technical knockout. The bout was stopped by the referee, on the advice of the ringside physician, due to a cut on Iwai's forehead.{{cite web |title=(レポ＆写真) [NJKF] 3.18 後楽園：洋平＆久保防衛。米田が新王者に |url=https://www.boutreview.com/data/reports05/070318njkf.html |website=www.boutreview.com |access-date=25 December 2023}} Following this victory, Kubo was ranked as the second-best featherweight in the WBC Muaythai Japan rankings, only behind Genki Yamamoto.{{cite web |title=ムエタイ インフォ：WBCムエタイ日本ランキング |url=https://www.canal-area.com/1-wbcjapanranking.html |website=www.canal-area.com |access-date=25 December 2023}}

Kubo faced Farkamwang SKV Gym at NJKF "Fighting Evolution VI" on May 13, 2007, in a WINDY CUP sponsored fight, who offered the winner an additional prize of ฿100,000 (~¥360,000). He won the fight by majority decision, with scores of 50–49, 50–50 and 50–48.{{cite web |title=(レポ＆写真) [NJKF] 5.13 後楽園：米田、ワンロップに惜敗。久保14連勝 |url=https://www.boutreview.com/data/reports05/070513njkf.html |website=www.boutreview.com |access-date=25 December 2023}}

Kubo faced Chaichana Patong Gym for the WPMO World Super featherweight (-60 kg) championship at "World Muay Thai Federation Championship" on July 3, 2007. He won the fight by a fifth-round knockout.{{cite web |title=GBR>試合結果>【NJKF】7・13久保優太＆賢司が兄弟揃ってタイ遠征でKO勝利！ |url=https://gbring.com/sokuho/result/result2007_07/0729_njkf_02.htm |website=gbring.com |access-date=25 December 2023}} Kubo next faced Soug-Uk Lee at NJKF "Fighting Evolution VIII -The Next Generation-" on September 2, 2007.{{cite web |title=[NJKF] 9.2 後楽園：久保優太＆賢司の兄弟が韓国王者と対戦 |url=https://www.boutreview.com/data/news05/070902njkf.html |website=www.boutreview.com |access-date=25 December 2023}} He won the fight by a third-round knockout.{{cite web |title=(レポ＆写真) [NJKF] 9.2 後楽園：笛吹引分防衛。久保弟が王者に |url=https://www.boutreview.com/data/reports05/070902njkf.html |website=www.boutreview.com |access-date=25 December 2023}}

Kubo's 16-fight undefeated streak was snapped by Nuang Solia, who was able to overcome the Japanese fighter by unanimous decision at a "Removing Land Mines" charity event, held on November 21, 2007. Kubo was then booked to face Shunta Ito at NJKF "Start Of New Legend" on January 27, 2008.{{cite web |title=GBR＞ニュース＞【NJKF】1・27NJKF対MAフェザー級王者対決！久保優太VS駿太が決定 |url=https://gbring.com/sokuho/news/2007_11/1126_njkf.htm |website=gbring.com |access-date=25 December 2023}} Ito won the fight by unanimous decision. Kubo suffered the first knockdown of his professional career during this fight, as his opponent dropped him with a left hook in the fourth round.{{cite web |title=(レポ＆写真) [NJKF] 1.27 後楽園：駿太、久保優太との王者対決制す |url=https://www.boutreview.com/data/reports05/080127njkf.html |website=www.boutreview.com |access-date=25 December 2023}}{{cite web |title=GBR>試合結果>【NJKF】MAとの王者対決は1勝1敗のドロー！久保が駿太に破れ、米田はRIOTに勝利 |url=https://gbring.com/sokuho/result/result2008_01/0127_njkf.htm |website=gbring.com |access-date=25 December 2023}}

Kubo challenged the WMAF World Super featherweight champion Takashi "TURBO" Nagatsuka at MAJKF "Break Through - 3" on April 29, 2008. The fight was ruled a split decision draw, with one 49–48 scorecard for Kubo and Nagatsuka respectively, as well as one even 49–49 scorecard.{{cite web |title=GBR>試合結果>【MA日本キック】水町が新世界王者に！TURBOは久保とドロー防衛、西山は壮泰を1RKO |url=https://gbring.com/sokuho/result/result2008_04/0429_makick.htm |website=gbring.com |access-date=25 December 2023}}

Kubo was expected to face Rashata at "NJKF Start of a New Legend IX" on July 27, 2008, but was forced to withdraw after being diagnosed with bladder stones.{{cite web |title=GBR＞ニュース＞【NJKF】7・27TURBO、久保優太の欠場で対戦カード変更 |url=https://gbring.com/sokuho/news/2008_07/0726_njkf.htm |website=gbring.com |access-date=25 December 2023}}

Kubo faced Yosuke Mizuochi in the reserve bout of the 2009 Krush Lightweight Grand Prix, held on November 2, 2009.{{cite web |title=立ち技格闘技のなかでも６０キロ級といえば、スピード・テクニックの両面で目を見張る（というより追いつかないほど？）世界。 |url=http://www.voiceon.co.jp/d_message/msg_0176.html |website=www.voiceon.co.jp |access-date=25 December 2023}}{{cite web |title=GBR>ニュース>【Krush】サバイバーとの協力体制を発表、山内裕太郎がドラゴと再戦決定 |url=https://gbring.com/sokuho/news/2009_11/1101_krush_04.htm |website=gbring.com |access-date=25 December 2023}} He won the fight by majority decision. As the one of tournament finalists, Naoki Ishikawa, was forced to drop out of the contest due to a cut on his left eyelid, Kubo stepped in to face Masahiro Yamamoto in the Grand Prix finals. He lost the fight by unanimous decision.{{cite web |title=GBR>試合結果>【Krush】山本真弘が逆転KOで3度目のトーナメント制覇！石川は狂拳を飛びヒザKO |url=https://gbring.com/sokuho/result/result2009_11/1102_krush.htm |website=gbring.com |access-date=25 December 2023}}

Kubo faced Tsuyoshi at M&J Presents Survivor Round.2 on December 9, 2009.{{cite web |title=GBR>ニュース>【サバイバー】12・9久保優太と対戦するTSUYOSHI「パンチがかすれば倒せる」 |url=https://gbring.com/sokuho/news/2009_12/1208_survivor_02.htm |website=gbring.com |access-date=25 December 2023}} He won the fight by unanimous decision, with scores of 30–28, 29–28 and 30–28.{{cite web |title=GBR>試合結果>【サバイバー】久保兄弟の明暗分かれる！優太が勝利もKENJI判定負け |url=https://gbring.com/sokuho/result/result2009_12/1209_survivor.htm |website=gbring.com |access-date=25 December 2023}} Kubo next faced Junpei Aotsu at Krush × Survivor on March 13, 2010. He won the fight by unanimous decision, with scores of 30–28, 30–29 and 30–28.{{cite web |title=GBR>試合結果>【Krush×サバイバー】大月晴明、久保優太が勝利！寺戸伸近はKENJIに圧勝 |url=https://gbring.com/sokuho/result/result2010_03/0313_krush.htm |website=gbring.com |access-date=25 December 2023}}

Kubo faced "DJ" Taiki Hata in the round of 16 of the 2010 K-1 Japan MAX Lightweight (-62.5 kg) tournament, held on May 2, 2010, to determine the eight fighters that would take part in the one-day final tournament on July 5, 2010.{{cite web |title=GBR>ニュース>【K-1MAX】7・5魔裟斗も激励！久保優太「僕がチャンピオンにならなきゃいけないと思います」 |url=https://gbring.com/sokuho/news/2010_07/0701_k-1max.htm |website=gbring.com |access-date=25 December 2023}} He won the fight by a dominant unanimous decision, with all three ringside officials awarding him a 30–27 scorecard.{{cite web |title=GBR>試合結果>【K-1MAX】壮絶な決勝戦！ダウンの応酬の末、大和哲也が逆転KOで優勝（1） |url=https://gbring.com/sokuho/result/result2010_07/0705_k-1max.htm |website=gbring.com |access-date=25 December 2023}} Kubo faced Keiji Ozaki in the quarterfinals of the 2010 K-1 MAX tournament on July 5. He triumphed over the veteran by unanimous decision, with three scorecards of 30–29.{{cite web |title=GBR>試合結果>【K-1MAX】壮絶な決勝戦！ダウンの応酬の末、大和哲也が逆転KOで優勝（3） |url=https://gbring.com/sokuho/result/result2010_07/0705_k-1max_03.htm |website=gbring.com |access-date=25 December 2023}} Kubo faced Yoshimichi Matsumoto in the semifinals and was able to make quick work of his opponent, stopping him with a question mark kick 81 seconds into the opening round.{{cite web |title=GBR>試合結果>【K-1MAX】壮絶な決勝戦！ダウンの応酬の末、大和哲也が逆転KOで優勝（1） |url=https://gbring.com/sokuho/result/result2010_07/0705_k-1max.htm |website=gbring.com |access-date=25 December 2023}} Kubo faced the WBC Muaythai Japan lightweight champion Tetsuya Yamato in the tournament finals. In spite of his early success, which saw him knock Yamato down with a left straight in the very first round of the contest, he was nonetheless knocked out by Yamato at the 1:26 minute mark of the final round.{{cite web |title=大和、３連続KOで初代王者に 自演乙は初のベスト８ 〜K-1 WORLD MAX2010〜 – SPORTS COMMUNICATIONS |url=https://www.ninomiyasports.com/archives/4266 |website=ninomiyasports.com |date=6 July 2010 |access-date=25 December 2023 |language=ja}}

After suffering a career-first stoppage loss at the hands of Tetsuya Yamato, Kubo was booked to face Hiroya at K-1 World MAX 2010 -70kg World Championship Tournament Final on November 8, 2010.{{cite web |title="魔裟斗２世"復活へ、ＨＩＲＯＹＡが世界への飛躍誓う 打倒・久保へ気合十分=K-1MAX |url=https://sports.yahoo.co.jp/column/detail/201010260004-spnavi |website=スポーツナビ |access-date=26 December 2023 |language=ja |date=22 December 2023}} He won the fight by unanimous decision.{{cite web |title=第7試合（久保VSHIROYA）、第6試合（佐藤VSグロガフスキー）、第5試合（ドラゴVSカマル）、第4試合（ペトロシアンVSクラウス）の試合結果はこちら |url=https://gbring.com/sokuho/result/result2010_11/1108_k-1max_02 |access-date=26 December 2023}} Kubo next faced Densiam Lukprabaht at Survivor -Round.7- on May 27, 2011. He won the fight by a third-round knockout.{{cite web |title=Survivor Rund.7 久保優太 2011年の初試合 |url=http://ebizoukun.jugem.jp/?eid=6 |access-date=26 December 2023}}

These two victories earned Kubo a place in the K-1 World MAX 2011 –63 kg Japan Tournament Final, which was held on June 25, 2011. Kubo faced Kizaemon Saiga in the quarterfinals of the one-day tournament and was able to overcome him by a narrow majority decision, with scores of 30–29, 30–30 and 30–29.{{cite web |title=GBR>試合結果>【K-1MAX】久保が決勝で卜部を下してトーナメント優勝！佐藤はクラウスにリベンジ（3） |url=https://gbring.com/sokuho/result/result2011_06/0625_k-1max_03.htm |website=gbring.com |access-date=26 December 2023}} Advancing to the semifinals, he faced the 2009 K-1 Koshien winner Masaaki Noiri. Kubo won the fight by a more convincing unanimous decision, with three scorecards of 30–29 in his favor.{{cite web |title=GBR>試合結果>【K-1MAX】久保が決勝で卜部を下してトーナメント優勝！佐藤はクラウスにリベンジ（2） |url=https://gbring.com/sokuho/result/result2011_06/0625_k-1max_02.htm |website=gbring.com |access-date=26 December 2023}} Kubo then faced Koya Urabe in the finals of the one-day tournament. He won the fight by unanimous decision, with scores of 30–28, 30–29 and 30–28.{{cite web |title=GBR>試合結果>【K-1MAX】久保が決勝で卜部を下してトーナメント優勝！佐藤はクラウスにリベンジ |url=https://gbring.com/sokuho/result/result2011_06/0625_k-1max.htm |website=gbring.com |access-date=26 December 2023}} During a post-fight interview, Kubo stated he intended to retire had he not won the tournament, having said as much to his sponsors before the event took place.{{cite web |title=GBR>ニュース>【K-1MAX】トーナメント優勝の久保優太「負けたら引退」を懸けていた |url=https://gbring.com/sokuho/news/2011_06/0625_k-1max.htm |website=gbring.com |access-date=26 December 2023}}

Kubo faced Andre Brul at K-1 World MAX 2011 -70kg Japan Tournament Final on September 25, 2011, in what was his final appearance at lightweight.{{cite web |title=GBR - ニュース - 【K-1MAX】9・25久保優太が王者としての第一戦！全対戦カードが決定 |url=https://gbring.com/sokuho/news/2011_09/0912_k-1max_02.htm |website=gbring.com |access-date=26 December 2023}} He won the fight by a wide unanimous decision, with two scorecards of 30–24 and one scorecard of 30–25. Kubo was able to knock Brul down twice in the opening round, with a middle kick and a knee to the body, as well as once in the second round, with a crescent kick.{{cite web |title=GBR - 試合結果 - 【K-1MAX】名城裕司がクラウス、森田崇文、山本優弥を破ってトーナメント制覇！ |url=https://gbring.com/sokuho/result/result2011_09/0925_k-1max.htm |website=gbring.com |access-date=26 December 2023}}

Kubo faced Tristan Benard in a -64 kg catchweight bout at Krush 13 on November 12, 2011. He won the fight by a third-round knockout.{{cite web |last1=格闘技情報を毎日配信！ |first1=eFight 【イーファイト】 |title=【Krush】ヨーロッパとの対抗戦は日本全勝！久保優太＆瀧谷渉太はKO勝利 |url=https://efight.jp/result-20111112_13888 |website=eFight【イーファイト】格闘技情報を毎日配信！ |date=12 November 2011 |access-date=26 December 2023 |language=ja}} Kubo faced Nils Widlund in another -64 kg catchweight bout at Fight For Japan: Genki Desu Ka Omisoka 2011 on December 31, 2011.{{cite web |title=ＤＲＥＡＭ大晦日で久保ｖｓヴィーランド - 格闘技ニュース |url=https://www.nikkansports.com/battle/news/p-bt-tp0-20111221-879200.html |website=nikkansports.com |access-date=26 December 2023 |language=ja}} He won the fight by a third-round knockout, flooring Widlung with a high kick at the 1:10 minute mark of the round.{{cite web |title=GBR - 試合結果 - 【元気ですか!!】第1部：今成正和が準決勝で敗退、所は失神KO負け！ |url=https://gbring.com/sokuho/result/result2011_12/1231_genki_1.html |website=gbring.com |access-date=26 December 2023}}

On February 17, 2012, at Krush 16, Kubo defeated Charles François via second-round knockout to win the vacant ISKA World Light-Welterweight (64.5 kg) Championship in Tokyo, Japan.{{cite web|url=http://www.liverkick.com/index.php?option=com_content&view=article&id=1304:krush16-results-kubo-and-sato-claim-iska-titles-xu-yan-kos-yuya-yamamoto&catid=38:asia&Itemid=59|title=Krush.16 Results: Kubo and Sato Claim ISKA Titles, Xu Yan KOs Yuya Yamamoto|first=Dave|last=Walsh|date=11 October 2017 }}

On June 8, 2012, At Krush 18 in Tokyo, Japan, Yuta faced Abdellah Ezbiri.{{cite web |title=GBR - ニュース -【Krush】6・8久保優太がKO宣言！フランス王者を迎え撃つ |url=https://gbring.com/sokuho/news/2012_05/0508_krush_02.htm |website=gbring.com |access-date=26 December 2023}} Despite his aggressive style Ezbiri seemed gun shy in the 1st round giving it to his opponent. Yuta dropped Ezbiri twice in the second, the 1st time with a right hook, the second with a spinning back fist but got up both times showing extreme toughness and heart and stayed on his feet in the 3rd even though Kubo is known for finishing his opponents quickly when he smells blood. Yuta Kubo won the fight by unanimous decision.{{cite web |title=【Krush】久保優太がダウンを奪って未知の強豪を撃退、70kg級転向へ |url=https://efight.jp/result-20120608_10330 |website=eFight【イーファイト】格闘技情報を毎日配信！ |date=8 June 2012 |access-date=26 December 2023 |language=ja}}

Kubo faced Yuya Yamato at Krush.22 on August 26, 2012.{{cite web |title=GBR - ニュース -【Krush】8・26久保優太、名古屋大会に参戦、WBC王者と王者対決！ |url=https://gbring.com/sokuho/news/2012_07/0706_krush.htm |website=gbring.com |access-date=26 December 2023}} He won the fight by a second-round knockout.{{cite web |title=GBR - 試合結果 -【Krush】瀧谷が打ち合い制して2度目の防衛成功、久保は大和をハイキックKO！ |url=https://gbring.com/sokuho/result/result2012_08/0826_krush.htm |website=gbring.com |access-date=26 December 2023}}

He was expected to make his middleweight (-70 kg) debut at Glory 4: Tokyo - 2012 Heavyweight Grand Slam on December 2, 2012 against an unnamed opponent,{{cite web|url=http://www.liverkick.com/index.php?option=com_content&view=article&id=1936:yuta-kubo-yuichiro-nagashima-fighting-at-glory-4-tokyo-december-2&catid=50:glory|title=Yuta Kubo, Yuichiro Nagashima Fighting At GLORY 4 Tokyo, December 2|first=Rian|last=Scalia|date=5 February 2020 }}{{cite web |title=【Glory04】久保優太、GLORYで目指す打倒ペトロシアン!! |url=https://mmaplanet.jp/4295 |website=MMAPLANET |access-date=26 December 2023}} but it fell through after the event was moved back to December 31 and combined with Dream 18.

Kubo competed in the Krush Grand Prix 2013 ~67kg First Class Tournament~ on January 14, 2012 and was initially set to fight Houcine Bennoui in the quarter-finals.{{cite web|url=http://www.liverkick.com/index.php?option=com_content&view=article&id=2021:yuta-kubo-yuji-nashiro-to-compete-in-krush-67kg-gp&catid=37:kickboxing|title=Yuta Kubo, Yuji Nashiro to Compete in Krush 67kg GP|first=Dave|last=Walsh|date=5 February 2020 }}{{cite web|url=http://liverkick.com/index.php?option=com_content&view=article&id=2142:krush-announces-67kg-tournament-quarterfinal-matchups&catid=37:kickboxing|title=Krush Announces 67kg Tournament Quarterfinal Matchups|first=Dave|last=Walsh|date=5 February 2020 }} However, Bennoui pulled out and was replaced by Roman Mailov.{{cite web|url=http://liverkick.com/index.php?option=com_content&view=article&id=2162:roman-mailov-replaces-houcine-bennoui-faces-yuta-kubo-at-krush26&catid=37:kickboxing|title=Roman Mailov replaces Houcine Bennoui, faces Yuta Kubo at Krush GP 2013|first=Rian|last=Scalia|date=5 February 2020 }}{{cite web|url=http://liverkick.com/index.php?option=com_content&view=article&id=2190:fights-to-watch-in-january-2013&catid=34:demo-content|title=Fights To Watch In January 2013|first=Rian|last=Scalia|date=5 February 2020 }} Mailov then sustained an injury in training as well, though, and lowly-ranked TaCa was brought in as Kubo's third opponent.{{cite web|url=http://liverkick.com/index.php?option=com_content&view=article&id=2200:taca-replaces-roman-mailov-in-krush-67kg-tournament&catid=37:kickboxing|title=TaCa Replaces Roman Mailov in Krush 67kg Tournament|first=Dave|last=Walsh|date=5 February 2020 }} He stopped TaCa with one of his signature body shots in round two. In the semis, Kubo dropped Shintaro Matsukura with a first round punch to the body and cruised to a unanimous decision but not without taking significant damage to his lead leg. A rematch with Abdellah Ezbiri then awaited him in the final. Kubo started the fight well but the tide started to turn in round two when Ezbiri began taking advantage of his injured leg to the point where he was having trouble standing. The bout was scored a unanimous draw after the regulation three rounds and so it went to a first extension round which was called a majority draw, much to the distaste of the crowd who booed the decision as they believed Ezbiri was dominant. Kubo rallied in the second extension round to take a unanimous decision, winning the tournament and the inaugural Krush 67 kg title.{{cite web|url=http://liverkick.com/index.php?option=com_content&view=article&id=2218:krush-67kg-tournament-results-kubo-wins-tournament-in-disputed-decision-alamos-upsets-takiya&catid=38:asia&Itemid=59|title=Krush 67kg Tournament Results: Kubo Wins Tournament in Disputed Decision, Alamos Upsets Takiya|first=Dave|last=Walsh|date=5 February 2020 }}

Kubo faced Lim Chi-Bin in the quarterfinals of the 2013 Glory Featherweight (-65 kg) Slam Tournament, held at Glory 8: Tokyo on May 3, 2013.{{cite web|url=http://liverkick.com/index.php?option=com_content&view=article&id=2410:glory-8-tokyo-65kg-tournament-field-complete-more-fights-added&catid=50:glory|title=GLORY 8 Tokyo: 65kg Tournament Field Complete, More Fights Added|first=Rian|last=Scalia|date=25 May 2018 }}{{cite web|url=http://liverkick.com/index.php?option=com_content&view=article&id=2437:glory-8-tokyo-65kg-tournament-matches-announced&catid=50:glory|title=GLORY 8 Tokyo 65kg Tournament Matches Announced|first=Rian|last=Scalia|date=3 August 2018 }} He won the fight by a second-round knockout. Kubo knocked Lim down with a knee to the midsection in the clinch in the final seconds of the round, which left the Korean unable to rise from the canvas.{{cite web |title=【グローリー】－65kg世界大会は久保が野杁を破り優勝 |url=https://efight.jp/result-20130503_16216/3?bp=1 |website=eFight【イーファイト】格闘技情報を毎日配信！ | date=3 May 2013 |access-date=26 December 2023 |language=ja}} Kubo overcame Gabriel Varga by unanimous decision in the tournament semifinals and faced Masaaki Noiri in the finals of the one-day contest.{{cite web |title=【グローリー】－65kg世界大会は久保が野杁を破り優勝 |url=https://efight.jp/result-20130503_16216/2?bp=1 |website=eFight【イーファイト】格闘技情報を毎日配信！ | date=3 May 2013 |access-date=26 December 2023 |language=ja}} He won the fight by unanimous decision. Aside from capturing the tournament title, Kubo was furthermore awarded $100,000 in prize money as well.{{cite web|url=http://liverkick.com/index.php?option=com_content&view=article&id=2476:glory-8-tokyo-live-results&catid=38:asia&Itemid=59|title=GLORY 8 Tokyo Live Results|first=Rian|last=Scalia|date=15 April 2019 }}[http://fightsportasia.com/2013/05/03/glory-8-tokyo-results-and-review-yuta-kubo-proves-why-he-is-the-number-one-japanese-fighter-in-the-world/ GLORY 8 Tokyo Results and Review: Yuta Kubo Proves Why He is the Number One Japanese Fighter in the World] {{webarchive |url=https://web.archive.org/web/20130506050612/http://fightsportasia.com/2013/05/03/glory-8-tokyo-results-and-review-yuta-kubo-proves-why-he-is-the-number-one-japanese-fighter-in-the-world/ |date=May 6, 2013 }}[http://www.muaythaiauthority.com/2013/05/glory-8-results-yuta-kubo-wins.html Glory 8 Results: Yuta Kubo wins featherweight tournament] {{webarchive |url=https://web.archive.org/web/20150709212526/http://www.muaythaiauthority.com/2013/05/glory-8-results-yuta-kubo-wins.html |date=July 9, 2015 }}

Kubo had his three year-spanning, seventeen fight win streak broken in his rubber match with Masaaki Noiri at Krush.32 in Nagoya, Japan on September 1, 2013, losing his Krush 67 kg title in the process.{{cite web|url=http://liverkick.com/index.php?option=com_content&view=article&id=2568:yuta-kubo-and-masaaki-noiri-fight-for-third-time-at-krush32&catid=37:kickboxing|title=Yuta Kubo and Masaaki Noiri Fight For Third Time at Krush.32|first=Rian|last=Scalia|date=5 February 2020 }} He was docked a point for excessive clinching in round three, allowing Noiri to take a wide unanimous decision.{{cite web|url=http://liverkick.com/index.php?option=com_content&view=article&id=2636:revenge-is-sweet-masaaki-noiri-defeats-yuta-kubo-at-krush-32&catid=37:kickboxing|title=Revenge is Sweet: Masaaki Noiri Defeats Yuta Kubo at Krush .32|first=Dave|last=Walsh|date=5 February 2020 }}

Kubo faced Mosab Amrani at Glory 13: Tokyo on December 21, 2013.{{cite web |title=【GLORY13】アーツ引退試合、注目65キロ戦久保×アムラーニ |url=https://mmaplanet.jp/6125 |website=MMAPLANET |access-date=26 December 2023}} He lost the fight by unanimous decision, with all three judges awarding Amrani all three rounds of the bout.{{cite web |title=【GLORY13】久保優太、左ミドルでアムラーニ止められず。完敗 |url=https://mmaplanet.jp/6136 |website=MMAPLANET |access-date=26 December 2023}}

Kubo faced Raz Sarkisjan in the quarterfinals of the 2014 K-1 World Super Lightweight Grand Prix, held on November 3, 2014. Despite successfully making his way past Sakisijan by way of unanimous decision,{{cite web |title=【K-1】無敵ゲーオがK-1世界トーナメントをも制す |url=https://efight.jp/result-20141103_78510/2 |website=eFight【イーファイト】格闘技情報を毎日配信！ |date=3 November 2014 |access-date=26 December 2023 |language=ja}} Kubo was nonetheless handed his second career stoppage loss by the eventual tournament winner Kaew Fairtex in the semifinals, who floored him with a left hook in the second round.{{cite web |title=【K-1】無敵ゲーオがK-1世界トーナメントをも制す |url=https://efight.jp/result-20141103_78510 |website=efight.jp |date=3 November 2014 |access-date=26 December 2023}}

Kubo faced Yasuomi Soda at K-1 World GP 2015 -55kg Championship Tournament on April 19, 2015.{{cite web |title=K-1 4.19代々木大会のスーパーファイトで左右田泰臣vs.久保優太、HIROYAvs.木村"フィリップ"ミノルが決定 |url=https://battle-news.com/?p=5193 |website=バトル・ニュース |access-date=26 December 2023 |language=ja}} He lost the fight by unanimous decision, with scores of 30–28, 29–27 and 30–27.{{cite web |title=【K-1】木村ミノル、HIROYAを1RでKO圧勝 |url=https://efight.jp/result-20150419_152199/2?bp=1 |website=efight.jp | date=19 April 2015 |access-date=26 December 2023}}

Kubo faced Noman in the quarterfinals of the 2016 K-1 World Super Lightweight Grand Prix, which was held on March 4, 2016.{{cite web |title=テレ東「新Ｋ－１伝説」久保優太－ＮＯＭＡＮを特集 - 格闘技 : 日刊スポーツ |url=https://www.nikkansports.com/battle/news/1605458.html |website=nikkansports.com |access-date=26 December 2023 |language=ja}} He won the fight by unanimous decision, with two scorecards of 30–28 and one scorecard of 30–29 in his favor.{{cite web |title=【K-1】山崎秀晃が野杁正明を破り優勝、打倒ゲーオを宣言 |url=https://efight.jp/result-20160304_234178/3?bp=1 |website=efight.jp | date=4 March 2016 |access-date=26 December 2023}} Kubo advanced to the semifinals, where he faced Hideaki Yamazaki. Yamazaki, the eventual tournament winner, won the fight by a third-round technical knockout.{{cite web |title=【K-1】山崎秀晃が野杁正明を破り優勝、打倒ゲーオを宣言 |url=https://efight.jp/result-20160304_234178 |website=efight.jp |date=4 March 2016 |access-date=26 December 2023}}

Kubo faced Keita Makihira at K-1 World GP in Japan Featherweight Championship Tournament on November 2, 2016, in his return to the welterweight (-67.5 kg) division.{{cite web |title=11・3代々木 久保優太、新階級ウェルター級のエースになる！牧平圭太「何が何でも勝って自分を変える」 |url=https://battle-news.com/?p=23536 |website=バトル・ニュース |access-date=27 December 2023 |language=ja}}{{cite web |title=【K-1】久保優太、ウェルター級で再び世界一の座へ「残りの格闘技人生のためにも負けられない」 |url=https://sports.yahoo.co.jp/column/detail/201610120004-spnavi |website=スポーツナビ |access-date=27 December 2023 |language=ja |date=23 December 2023}} He won the fight by unanimous decision, with scores of 29–28, 30–29 and 29–27, after knocking Makihara down once in the second round.{{cite web |title=【K-1】久保がダウンを奪いウェルター級初戦を勝利で飾る |url=https://efight.jp/result_s-20161104_249489 |website=eFight【イーファイト】格闘技情報を毎日配信！ |date=4 November 2016 |access-date=27 December 2023 |language=ja}}{{cite web |title=新Ｋ１伝説12・８放送は久保優太－牧平圭太など - 格闘技 : 日刊スポーツ |url=https://www.nikkansports.com/battle/news/1748208.html |website=nikkansports.com |access-date=27 December 2023 |language=ja}}

Kubo faced Xie Lei at Wu Lin Feng World Championship 2017 on January 14, 2017. He lost the fight by unanimous decision.{{cite web |title=『武林風 全球功夫盛典』中国河南省鄭州市大会！K-1 WORLD GP-65kg王者ゲーオー判定勝ち！久保優太判定敗け！中国常連選手は判定勝ち！ |url=https://miruhon.net/58565 |website=週刊ファイト |access-date=27 December 2023 |language=ja |date=15 January 2017}}

Kubo faced Kazuki Yamagiwa at Bigbang 29: Road to Unification on June 4, 2017.{{cite web |title=【Bigbang.29】ポスター画像を公開！山際和希、久保優太を超えられるか 6/4(日) |url=https://royalroa-d.com/archives/3815 |website=Royal Road |access-date=27 December 2023 |date=6 May 2017}} The fight ended in a majority decision draw. Although one judge awarded Kubo a 29–28 scorecard, he was overruled by his colleagues, who had the bout scored as an even 29–29 and 28–28 respectively.{{cite web |title=【ビッグバン】久保優太と山際和希の注目の一戦は痛み分け |url=https://efight.jp/result-20170604_261555 |website=eFight【イーファイト】格闘技情報を毎日配信！ |date=4 June 2017 |access-date=27 December 2023 |language=ja}}

On July 19, 2017, it was announced that Kubo would be one of eight participants of the 2017 K-1 World Welterweight Grand Prix. Kubo faced Minoru Kimura in the quarterfinals of the one-day tournament, which took place on September 18, 2017.{{cite web |title=『K-1 WORLD GP 2017 JAPAN ～初代ウェルター級王座決定トーナメント～』対戦カードが発表に 外国人選手コメントも公開 {{!}} SPICE - エンタメ特化型情報メディア スパイス |url=https://spice.eplus.jp/articles/136338 |website=SPICE（スパイス）｜エンタメ特化型情報メディア スパイス |access-date=27 December 2023 |language=ja}} He won the fight by unanimous decision, with two scorecards of 29–27 and one scorecard of 30–26 in his favor. Kubo was twice able to knock Kimura down, once in the second and once in the third round.{{cite web |title=【K-1】久保優太、木村との元同門対決制す |url=https://efight.jp/result_s-20170918_268114?bp=1 |website=eFight【イーファイト】格闘技情報を毎日配信！ | date=18 September 2017 |access-date=27 December 2023 |language=ja}} He made quick work of his semifinal opponent, Hitoshi Tsukakoshi, as he twice knocked his opponent down by the 2:36 minute mark of the opening round.{{cite web |title=【K-1】久保優太、Krush王者・塚越をローで秒殺 |url=https://efight.jp/result_s-20170918_268094?bp=1 |website=eFight【イーファイト】格闘技情報を毎日配信！ | date=18 September 2017 |access-date=27 December 2023 |language=ja}} Kubo captured the tournament title, as well as the inaugural K-1 World GP Welterweight (-67.5 kg) Championship with a unanimous decision victory over Mohan Dragon in the Grand Prix finals.{{cite web |last1=編集部 |first1=ABEMA TIMES |title=久保優太、引退覚悟からの復活優勝＆全力ファイトでハートを鷲掴み！モハン・ドラゴン…涙、ドラマだらけだったK-1初代ウェルター級王座決定トーナメント {{!}} ニュース {{!}} ABEMA TIMES {{!}} アベマタイムズ |url=https://times.abema.tv/articles/-/2975224 |website=ABEMA TIMES |access-date=27 December 2023 |language=ja |date=24 October 2019}}{{cite web |title=初代ウェルター級トーナメントは「非情」に徹した久保優太が優勝！ネパールの剛腕、モハン・ドラゴンは大声援をバックに準優勝！ |url=https://battle-news.com/?p=33045 |website=バトル・ニュース |access-date=27 December 2023 |language=ja}}

Kubo made his fist K-1 World GP Welterweight (-67.5 kg) championship defense against Melsik Baghdasaryan at K-1 World GP 2018: K'FESTA.1 on March 21, 2018.{{cite web |title=久保賢司が「武居は相当性格が悪い」【3・21 K-1】 {{!}} TOKYO HEADLINE |url=https://www.tokyoheadline.com/390130/ |website=tokyoheadline.com |access-date=27 December 2023 |language=ja |date=23 February 2018}} He retained the title by unanimous decision.{{cite web |title=久保優太が判定勝ちで初防衛「最強の挑戦者だった」 - 格闘技 : 日刊スポーツ |url=https://www.nikkansports.com/battle/news/201803210000474.html |website=nikkansports.com |access-date=27 December 2023 |language=ja}}

Kubo made his second K-1 Welterweight championship defense against the 2008 K-1 World MAX Japan Tournament winner Yasuhiro Kido at K-1 World GP 2019: K’FESTA 2 on March 10, 2019.{{cite web |title=【K-1】ウェルター級王者・久保優太、残りの格闘技人生のためにもベルトは渡さない！「僕にとってベルトは重いもの。"最低でも勝ち"をテーマにしっかりベルトを守ります」＝3月10... |url=https://gonkaku.jp/articles/228 |website=ゴング格闘技 - GONKAKU |access-date=27 December 2023}} He won the fight by unanimous decision, after an extra fourth round was contested.{{cite web |title=【K-1】久保優太が城戸康裕との激しい延長戦を制しウェルター級王座防衛 |url=https://efight.jp/result_s-20190310_324927 |website=eFight【イーファイト】格闘技情報を毎日配信！ |date=10 March 2019 |access-date=27 December 2023 |language=ja}}

Kubo made his third and final K-1 Welterweight championship defense against the reigning Krush Super Welterweight champion Jordann Pikeur at K-1: K’Festa 3 on March 22, 2020.{{cite web |title=【K-1】ピケオー、離婚騒動のあった久保優太に「奥さんとは仲良くやってもらえればと思うがベルトは確実に失う」 |url=https://gonkaku.jp/articles/3402 |website=ゴング格闘技 - GONKAKU |access-date=27 December 2023}} He won the fight by unanimous decision, with all three judges scoring the bout 30–29 in his favor.{{cite web |title=【K-1】久保優太がピケオーに日本人初勝利で3度目の防衛に成功（動画あり） |url=https://efight.jp/result_s-20200322_414665 |website=eFight【イーファイト】格闘技情報を毎日配信！ |date=22 March 2020 |access-date=27 December 2023 |language=ja}}

Kubo retired from the sport of kickboxing on August 20, 2020.{{cite web |title=元K-1王者・久保優太がジム設立「世界No.1のジム目指す」 |url=https://efight.jp/news-20200820_455741 |website=efight.jp |date=20 August 2020 |access-date=30 September 2020}}

Kubo was scheduled to make his mixed martial arts debut, as a featherweight, against Shinobu Ota at Rizin 30 on September 19, 2021.{{cite web |title=【RIZIN】元K-1王者の久保優太、ぱんちゃん璃奈ら初参戦、久保は"忍者レスラー"太田忍とMMA戦 |url=https://news.yahoo.co.jp/articles/09ee9952ce9c3d79b1fd3dd51717883d4b099360 |website=news.yahoo.co.jp |access-date=11 August 2021}} He lost the fight by unanimous decision.{{cite web |title=【RIZIN】太田忍がMMA初勝利「塩試合みたいになってしまいましたが」、元K-1王者・久保優太は打撃活かせず |url=https://news.yahoo.co.jp/articles/f831d508248c1f25faae7168effa400e9086614a |website=news.yahoo.co.jp |access-date=19 September 2021}}

Kubo faced Youtuber Shibatar in a mixed rules bout at Rizin 33 - Saitama on December 31, 2021. The bout will be two 3 min rounds, with no decision, and the winner only being able to win via KO or submission. {{Cite web|title=シバターvs.久保がMMA特別ルールで対戦！Yogibo presents RIZIN.33追加カード - RIZIN FIGHTING FEDERATION オフィシャルサイト|url=https://jp.rizinff.com/_ct/17503266|access-date=2021-12-27|website=jp.rizinff.com|language=en}} Kubo lost the bout via flying armbar in the first round.{{Cite web|title=【ＲＩＺＩＮ】シバター「ユーチューバーは強いんだ」久保優太に一本勝ち - 格闘技 : 日刊スポーツ|url=https://www.nikkansports.com/battle/news/202112310000502.html|access-date=2021-12-31|website=nikkansports.com|language=ja}}

Kubo faced Keisuke Okuda at Rizin Landmark 4 on November 6, 2022. He won the fight by TKO stoppage at the end of the first round.{{Cite web |title=【RIZIN】平本蓮が弥益ドミネーターを空手＆ケージDFでドミネートし判定勝ち、鈴木千裕が今成越え、元谷が倉本と大激闘、SARAMIが魂のテイクダウンでラーラを下す、中村が征... |url=https://gonkaku.jp/articles/12040?page=11 |access-date=2022-11-06 |website=ゴング格闘技 - GONKAKU}}

Kubo faced Karate Kinoshita on June 24, 2023 at Rizin 43, winning the bout via split decision.{{Cite web |title=【RIZIN】王座剥奪のクレベルが鈴木千裕を腕十字葬で「次タイトルマッチを」、矢地がゼインに完勝、上田が関根をMMA空手でKO、"怪物くん"鈴木が西谷を失神TKO、ヒジ打ち梅... |url=https://gonkaku.jp/articles/14053?page=7 |access-date=2023-06-25 |website=ゴング格闘技 - GONKAKU}}

Kubo faced Rukiya Anpo in a special rules bout at Rizin 45 on December 31, 2023.{{cite web |date=10 December 2023 |title=【RIZIN】安保瑠輝也、大みそかで急きょMMAデビュー！ 対戦相手は元K-1王者・久保優太 |url=https://www.oricon.co.jp/news/2306076/full/ |access-date=10 December 2023 |website=ORICON NEWS}} He won the bout via rear-naked choke at the end of the first round.{{Cite web |last=格闘技情報を毎日配信！ |first=eFight 【イーファイト】 |title=【RIZIN】安保瑠輝也、MMAデビューは悔しい一本負け、久保優太に"自身予告"のチョークでタップ！ |url=https://efight.jp/result_s-20231231_1453796 |access-date=2024-02-19 |website=eFight【イーファイト】格闘技情報を毎日配信！ |date=31 December 2023 |language=ja}}

Kubo faced Ryogo Takahashi at RIZIN Landmark 9 on March 23, 2024, winning the bout via unanimous decision.{{Cite web |last=格闘技情報を毎日配信！ |first=eFight 【イーファイト】 |date=2024-03-23 |title=【RIZIN】久保優太が4連勝！高橋遼伍との打撃戦を制す＝試合結果 |url=https://efight.jp/result_s-20240323_1478756 |access-date=2024-06-09 |website=eFight【イーファイト】格闘技情報を毎日配信！ |language=ja}}

Kubo faced the former Rizin FF Featherweight champion Yutaka Saito at Super Rizin 3 on July 28, 2024.{{cite web |title=【SUPER RIZIN03】斎藤裕戦へ、久保優太「向き合った人にしか分からない恐怖を与えることができる」 |url=https://mmaplanet.jp/176580 |website=MMAPLANET |access-date=25 August 2024}} He won the fight by a second-round knockout.{{cite web |title=【超RIZIN】久保優太が斎藤裕をKOできた理由を明かす、そして「僕は絶対にRIZINフェザー級王者になります」と断言（ゴング格闘技） |url=https://news.yahoo.co.jp/articles/9fd0555560b1e5f9be629b8bfb1ec0295340ab14 |website=Yahoo!ニュース |access-date=25 August 2024 |language=ja}}

• New Japan Kickboxing Federation
• 2006 NJKF interim Featherweight (-57.5 kg) Championship
• 2007 NJKF Featherweight (-57.5 kg) Championship

• Krush
• 2009 Krush Lightweight (-62.5) Grand Prix Runner-up
• 2013 Krush Welterweight (-67.5 kg) Grand Prix Winner
• 2013 Krush Welterweight (-67.5 kg) Championship

• K-1
• 2010 K-1 World MAX Lightweight (-63 kg) Japan Tournament Runner-up
• 2011 K-1 World MAX Lightweight (-63 kg) Japan Tournament Winner
• 2017 K-1 World GP Welterweight (-67.5 kg) World Grand Prix Winner
• 2017 K-1 World GP Welterweight (-67.5 kg) Championship
• Three successful title defenses

• International Sport Kickboxing Association
• 2012 ISKA K-1 World Light-Welterweight (64.5 kg) Championship

• GLORY
• 2013 Glory 65kg Slam Tournament Winner

• World Professional Muaythai Federation
• 2007 WPMF World Super featherweight (-60 kg) Championship

• 2005 Best Rookie Award{{cite web|url=http://www.boutreview.com/data/reports05/060115njkf.html|title=(レポ＆写真) [NJKF] 1.15 後楽園：岩井＆高橋、ノンタイトル戦で完勝}} (NJKF, January 15, 2006)
• 2005 Gong Kakutogi Magazine Award (NJKF, January 15, 2006)
• 2005 Full Contact Karate Magazine Award (NJKF, January 15, 2006)
• 2006 Technique Award{{cite web|url=http://www.boutreview.com/data/news05/061214njkf-award.html|title=[NJKF] 2006年年間表彰に洋平・米田ら勢揃い｜藤田理事長退任}} (NJKF, December 23, 2006)
• 2007 Technique Award{{cite web|url=http://www.boutreview.com/data/news05/080107njkf-award.html|title=[NJKF] 2007年度MVPは前田浩喜。最高試合賞にTOMONORI}} (NJKF, January 6, 2008)

{{MMArecordbox

| draws=

| nc=

| ko-wins= 2

| sub-wins= 1

| dec-wins= 2

| ko-losses= 1

| sub-losses=

| dec-losses= 1

| dq-wins=

| dq-losses=

| other-wins=

| other-losses=

}}

{{MMA record start}}

|-

|{{no2}}Loss

|align=center|5–2

|Razhabali Shaidulloev

|TKO (punches)

|Rizin 49

|{{dts|2024|December|31}}

|align=center|2

|align=center|2:30

|Saitama, Japan

|

|-

|{{yes2}}Win

|align=center|5–1

|Yutaka Saito

|TKO (front kick to the body)

|Super Rizin 3

|{{dts|2024|July|28}}

|align=center|2

|align=center|4:19

|Saitama, Japan

|

|-

|{{yes2}}Win

|align=center|4–1

|Ryogo Takahashi

|Decision (unanimous)

|Rizin Landmark 9

|{{dts|2024|March|23}}

|align=center|3

|align=center|5:00

|Kobe, Japan

|{{small|Return to Featherweight.}}

|-

| {{yes2}}Win

| align=center|3–1

| Rukiya Anpo

| Submission (rear-naked choke)

| Rizin 45

| {{dts|2023|December|31}}

| align=center| 1

| align=center| 4:28

| Saitama, Japan

| {{small|Lightweight debut. Rizin MMA Special rules (2x5 minutes).}}

|-

|{{yes2}}Win

|align=center|2–1

|Takeaki Kinoshita

|Decision (split)

|Rizin 43

|{{dts|2023|June|24}}

|align=center|3

|align=center|5:00

|Sapporo, Japan

|

|-

|{{yes2}}Win

|align=center|1–1

|Keisuke Okuda

|TKO (elbows and punches)

|Rizin Landmark 4

|{{dts|2022|November|6}}

|align=center|1

|align=center|4:43

|Nagoya, Japan

|

|-

|{{no2}}Loss

|align=center|0–1

|Shinobu Ota

|Decision (unanimous)

|Rizin 30

|{{dts|2021|September|19}}

|align=center|3

|align=center|5:00

|Saitama, Japan

|{{small|Featherweight debut.}}

{{end}}

{{Kickboxing record start|title=Professional kickboxing record|record=49 Wins (19 (T)KO's), 10 Losses, 2 Draws}}

|- style="background:#cfc;"

| 2020-03-22||Win ||align=left|{{flagicon|NED}} Jordann Pikeur || K-1: K’Festa 3 || Saitama, Japan || Decision (Unanimous)|| 3|| 3:00|| 49–10–2

|-

! style=background:white colspan=9 |{{small|Defends the K-1 World GP Welterweight (-67.5 kg) Championship.}}

|-

|- bgcolor=#CCFFCC

| 2019-03-10|| Win ||align=left|{{flagicon|JPN}} Yasuhiro Kido || K-1 World GP 2019: K’FESTA 2 || Saitama, Japan || Ext.R Decision (Split) || 4 || 3:00|| 48–10–2

|-

! style=background:white colspan=9 |{{small|Defends the K-1 World GP Welterweight (-67.5 kg) Championship.}}

|-

|- bgcolor=#CCFFCC

| 2018-03-21 || Win || align=left|{{flagicon|Armenia}} Melsik Baghdasaryan || K-1 World GP 2018: K'FESTA.1 || Saitama, Japan || Decision (Unanimous) || 3 || 3:00|| 47–10–2

|-

! style=background:white colspan=9 |{{small|Defends the K-1 World GP Welterweight (-67.5 kg) Championship.}}

|-

|- bgcolor=#CCFFCC

| 2017-09-18|| Win ||align=left|{{flagicon|Nepal}} Mohan Dragon ||K-1 World GP 2016 -67.5kg World Tournament, Final|| Tokyo, Japan || Decision (Unanimous) || 3 || 3:00 || 46–10–2

|-

! style=background:white colspan=9 |{{small|Wins the K-1 World GP Welterweight (-67.5 kg) World Grand Prix and K-1 World GP Welterweight (-67.5 kg) Championship.}}

|-

|- bgcolor=#CCFFCC

| 2017-09-18|| Win ||align=left|{{flagicon|JPN}} Hitoshi Tsukakoshi ||K-1 World GP 2016 -67.5kg World Tournament, Semi Finals|| Tokyo, Japan || TKO (2 Knockdowns) || 1 || 2:36 || 45–10–2

|-

|- bgcolor=#CCFFCC

| 2017-09-18|| Win ||align=left|{{flagicon|BRA}} Minoru Kimura ||K-1 World GP 2016 -67.5kg World Tournament, Quarter Finals|| Tokyo, Japan || Decision (unanimous) || 3 || 3:00 || 44–10–2

|-

|- bgcolor=#c5d2ea

| 2017-06-04 || Draw ||align=left|{{flagicon|JPN}} Kazuki Yamagiwa || Bigbang 29: Road to Unification || Tokyo, Japan || Decision (Majority) || 3 || 3:00 || 43–10–2

|-

|- bgcolor=#FFBBBB

| 2017-01-14 || Loss ||align=left|{{flagicon|CHN}} Xie Lei || Wu Lin Feng World Championship 2017 || Zhengzhou, China || Decision (unanimous) || 3 || 3:00 || 43–10–1

|-

|- bgcolor=#CCFFCC

| 2016-11-02 || Win ||align=left|{{flagicon|JPN}} Keita Makihira || K-1 World GP in Japan Featherweight Championship Tournament|| Tokyo, Japan || Decision (unanimous) || 3 || 3:00 || 43–9–1

|-

|- bgcolor=#FFBBBB

| 2016-03-04 || Loss ||align=left|{{flagicon|JPN}} Hideaki Yamazaki || K-1 World GP 2016 -65kg Japan Tournament, Semi Finals || Tokyo, Japan || TKO (2 Knockdowns/Hook kick) || 3 || 2:57 || 42–9–1

|-

|- bgcolor=#CCFFCC

| 2016-03-04 || Win ||align=left|{{flagicon|JPN}} Noman || K-1 World GP 2016 -65kg Japan Tournament, Quarter Finals || Tokyo, Japan || Decision (unanimous) || 3 || 3:00 || 42–8–1

|-

|- bgcolor=#FFBBBB

| 2015-04-19 || Loss ||align=left|{{flagicon|JPN}} Yasuomi Soda || K-1 World GP 2015 -55kg Championship Tournament || Tokyo, Japan || Decision (unanimous) || 3 || 3:00 || 41–8–1

|-

|- bgcolor=#FFBBBB

| 2014-11-03 || Loss ||align=left|{{flagicon|THA}} Kaew Fairtex || K-1 World GP 2014 -65kg Championship Tournament, Semi Finals || Tokyo, Japan || KO (Right Hook) || 2 || 1:52 || 41–7–1

|-

|- bgcolor=#CCFFCC

| 2014-11-03 || Win ||align=left|{{flagicon|ARM}} Raz Sarkisjan || K-1 World GP 2014 -65kg Championship Tournament, Quarter Finals || Tokyo, Japan || Decision (Unanimous) || 3 || 3:00 || 41–6–1

|-

|- bgcolor=#FFBBBB

| 2013-12-21 || Loss ||align=left|{{flagicon|MAR}} Mosab Amrani || Glory 13: Tokyo || Tokyo, Japan || Decision (unanimous) || 3 || 3:00 || 40–6–1

|-

|- bgcolor=#FFBBBB

| 2013-09-01 || Loss ||align=left|{{flagicon|JPN}} Masaaki Noiri || Krush.32 || Nagoya, Japan || Decision (unanimous) || 3 || 3:00 || 40–5–1

|-

! style=background:white colspan=9 |{{small|Lost the Krush Welterweight (-67.5 kg) Championship.}}

|-

|- style="" bgcolor=#CCFFCC

| 2013-05-03 || Win ||align=left|{{flagicon|JPN}} Masaaki Noiri || Glory 8: Tokyo - 65 kg Slam Tournament, Final || Tokyo, Japan || Decision (unanimous) || 3 || 3:00 || 40–4–1

|-

! style=background:white colspan=9 |{{small|Wins the Glory Featherweight (-65kg) Slam Tournament.}}

|-

|- style="" bgcolor=#CCFFCC

| 2013-05-03 || Win ||align=left|{{flagicon|CAN}} Gabriel Varga || Glory 8: Tokyo - 65 kg Slam Tournament, Semi Finals || Tokyo, Japan || Decision (unanimous) || 3 || 3:00 || 39–4–1

|-

|- style="" bgcolor=#CCFFCC

| 2013-05-03 || Win ||align=left|{{flagicon|KOR}} Lim Chi-Bin || Glory 8: Tokyo - 65 kg Slam Tournament, Quarter Finals || Tokyo, Japan || KO (body shot) || 2 || 3:00 || 38–4–1

|-

|- style="" bgcolor=#CCFFCC

| 2013-01-14 || Win ||align=left|{{flagicon|FRA}} Abdellah Ezbiri || Krush Grand Prix 2013 ~67 kg Tournament~, Final || Tokyo, Japan || 2nd Ext.R Decision (unanimous) || 5 || 3:00 || 37–4–1

|-

! style=background:white colspan=9 |{{small|Wins the Krush Welterweight (-67.5 kg) Grand Prix and the Krush Welterweight (-67.5 kg) Championship.}}

|-

|- style="" bgcolor=#CCFFCC

| 2013-01-14 || Win ||align=left|{{flagicon|JPN}} Shintaro Matsukura || Krush Grand Prix 2013 ~67 kg Tournament~, Semi Finals || Tokyo, Japan || Decision (unanimous) || 3 || 3:00 || 36–4–1

|-

|- style="" bgcolor=#CCFFCC

| 2013-01-14 || Win ||align=left|{{flagicon|JPN}} TaCa || Krush Grand Prix 2013 ~67 kg Tournament~, Quarter Finals || Tokyo, Japan || KO (body punch) || 2 || 1:43 || 35–4–1

|-

|- style="" bgcolor=#CCFFCC

| 2012-08-26 || Win ||align=left|{{flagicon|JPN}} Yuya Yamato || Krush.22|| Tokyo, Japan || KO (left high kick)|| 2 || 0:51 || 34–4–1

|-

|- style="" bgcolor=#CCFFCC

| 2012-06-08 || Win ||align=left|{{flagicon|FRA}} Abdellah Ezbiri || Krush.19|| Tokyo, Japan || Decision (Unanimous)|| 3 || 3:00 || 33–4–1

|-

|- style="" bgcolor=#CCFFCC

| 2012-02-17 || Win ||align=left|{{flagicon|FRA}} Charles François || Krush.16|| Tokyo, Japan || KO (punch to the body)|| 2 || 2:18 || 32–4–1

|-

! style=background:white colspan=9 |{{small|Wins ISKA World Light-Welterweight (64.5kg) Championship.}}

|-

|- bgcolor=#CCFFCC

| 2011-12-31 || Win ||align=left|{{flagicon|SWE}} Nils Widlund || Fight For Japan: Genki Desu Ka Omisoka 2011 || Saitama, Japan || KO (Right High Kick) || 3 || 1:10 || 31–4–1

|-

|- bgcolor=#CCFFCC

| 2011-11-12 || Win ||align=left|{{flagicon|FRA}} Tristan Benard || Krush.13 || Tokyo, Japan || KO (Right Hook) || 3 || 0:52 || 30–4–1

|-

|- bgcolor=#CCFFCC

| 2011-09-25 || Win ||align=left|{{flagicon|GER}} Andre Brul || K-1 World MAX 2011 -70kg Japan Tournament Final || Osaka, Japan || Decision (Unanimous) || 3 || 3:00 || 29–4–1

|-

|- bgcolor=#CCFFCC

| 2011-06-25 || Win ||align=left|{{flagicon|JPN}} Koya Urabe || K-1 World MAX 2011 –63 kg Japan Tournament Final, Final || Shibuya, Tokyo, Japan || Decision (Unanimous) || 3 || 3:00 || 28–4–1

|-

! style=background:white colspan=9 |{{small|Wins the K-1 World MAX Lightweight (-63 kg) Japan Tournament Title.}}

|-

|- bgcolor=#CCFFCC

| 2011-06-25 || Win ||align=left|{{flagicon|JPN}} Masaaki Noiri || K-1 World MAX 2011 –63 kg Japan Tournament Final, Semi-final || Shibuya, Tokyo, Japan || Decision (Unanimous) || 3 || 3:00 || 27–4–1

|- bgcolor=#CCFFCC

| 2011-06-25 || Win ||align=left|{{flagicon|JPN}} Kizaemon Saiga || K-1 World MAX 2011 –63 kg Japan Tournament Final, Quarter-final || Shibuya, Tokyo, Japan || Decision (Majority) || 3 || 3:00 || 26–4–1

|- bgcolor=#CCFFCC

| 2011-05-27 || Win ||align=left|{{flagicon|THA}} Densiam Lukprabaht || Survivor -Round.7- || Shinjuku, Tokyo, Japan || KO (Left hook) || 3 || 0:53 || 25–4–1

|- bgcolor=#CCFFCC

| 2010-11-08 || Win ||align=left|{{flagicon|JPN}} Hiroya|| K-1 World MAX 2010 -70kg World Championship Tournament Final || Sumida, Tokyo, Japan || Decision (Unanimous) || 3 || 3:00 || 24–4–1

|- bgcolor=#FFBBBB

| 2010-07-05 || Loss ||align=left|{{flagicon|JPN}} Tetsuya Yamato || K-1 World MAX 2010 -63kg Japan Tournament Final, Final || Shibuya, Tokyo, Japan || KO (Right hook) || 3 || 1:26 || 23–4–1

|-

! style=background:white colspan=9 |{{small| The bout was for K-1 World MAX 2010 -63kg Japan Tournament.}}

|-

|- bgcolor=#CCFFCC

| 2010-07-05 || Win ||align=left|{{flagicon|JPN}} Yoshimichi Matsumoto || K-1 World MAX 2010 –63 kg Japan Tournament Final, Semi-final || Shibuya, Tokyo, Japan || KO (Brazilian kick) || 1 || 1:21 || 23–3–1

|- bgcolor=#CCFFCC

| 2010-07-05 || Win ||align=left|{{flagicon|JPN}} Keiji Ozaki || K-1 World MAX 2010 –63 kg Japan Tournament Final, Quarter-final || Shibuya, Tokyo, Japan || Decision (Unanimous) || 3 || 3:00 || 22–3–1

|- bgcolor=#CCFFCC

| 2010-05-02 || Win ||align=left|{{flagicon|JPN}} Taiki Hata || K-1 World MAX 2010 -63kg Japan Tournament Final 16, First Round of 22 || Bunkyō, Tokyo, Japan || Decision (Unanimous) || 3 || 3:00 || 21–3–1

|- bgcolor=#CCFFCC

| 2010-03-13 || Win ||align=left|{{flagicon|JPN}} Junpei Aotsu || Krush × Survivor || Bunkyō, Tokyo, Japan || Decision (Unanimous) || 3 || 3:00 || 20–3–1

|- bgcolor=#CCFFCC

| 2009-12-09 || Win ||align=left|{{flagicon|JPN}} Tsuyoshi || M&J Presents Survivor Round.2 || Shinjuku, Tokyo, Japan || Decision (Unanimous) || 3 || 3:00 || 19–3–1

|- bgcolor=#FFBBBB

| 2009-11-02 || Loss ||align=left|{{flagicon|JPN}} Masahiro Yamamoto || Krush Lightweight GP 2009 -Final Round-, Final || Bunkyō, Tokyo, Japan || Decision (Unanimous) || 3 || 3:00 || 18–3–1

|-

! style=background:white colspan=9 |{{small|For the Krush Lightweight Grand Prix Title.}}

|-

|- bgcolor=#CCFFCC

| 2009-11-02 || Win ||align=left|{{flagicon|JPN}} Yosuke Mizuochi || Krush Lightweight GP 2009 -Final Round-, Reserve match || Bunkyō, Tokyo, Japan || Decision (Majority) || 3 || 3:00 || 18–2–1

|- bgcolor=#CCFFCC

| 2009-09-28 || Win ||align=left|{{flagicon|JPN}} Takehiro Murahama || M&J Presents Survivor Opening Round.1 || Shinjuku, Tokyo, Japan || KO (Left cross) || 1 || 2:43 || 17–2–1

|- bgcolor=#c5d2ea

| 2008-04-29 || Draw ||align=left|{{flagicon|JPN}} Takashi Nagatsuka || MAJKF "Break Through - 3" || Kōtō, Tokyo, Japan || Decision (Split) || 5 || 3:00 || 16–2–1

|-

! style=background:white colspan=9 |{{small| The bout was for Nagatsuka's title of WMAF World Super featherweight Championship.}}

|-

|- bgcolor=#FFBBBB

| 2008-01-27 || Loss ||align=left|{{flagicon|JPN}} Shunta Ito || NJKF "Start Of New Legend" || Bunkyō, Tokyo, Japan || Decision (Unanimous) || 3 || 3:00 || 16–2

|- bgcolor=#FFBBBB

| 2007-11-21 || Loss ||align=left|{{flagicon|Cambodia}} Nuang Solia || Removing Land Mines Charity　Event || Cambodia || Decision (Unanimous) || 5 || 3:00 || 16–1

|- bgcolor=#CCFFCC

| 2007-09-02 || Win ||align=left|{{flagicon|KOR}} Soug-Uk Lee || NJKF "Fighting Evolution VIII -The Next Generation-" || Bunkyō, Tokyo, Japan || KO (Left knee shot) || 3 || 2:55 || 16–0

|- bgcolor=#CCFFCC

| 2007-07-13 || Win ||align=left|{{flagicon|THA}} Chaichana Patong Gym || World Muay Thai Federation Championship || Phuket, Thailand || KO (Right knee strike) || 5 || || 15–0

|-

! style=background:white colspan=9 |{{small| Wins vacant title of WPMO World Super featherweight Championship.}}

|-

|- bgcolor=#CCFFCC

| 2007-05-13 || Win ||align=left|{{flagicon|THA}} Farkamwang SKV Gym || NJKF "Fighting Evolution VI" || Kōtō, Tokyo, Japan || Decision (Majority) || 5 || 3:00 || 14–0

|- bgcolor=#CCFFCC

| 2007-03-18 || Win ||align=left|{{flagicon|JPN}} Nobuhiro Iwai || NJKF "Fighting Evolution III -3 Kings Champion Carnival-"|| Bunkyō, Tokyo, Japan || TKO (Cut) || 2 || 1:43 || 13–0

|-

! style=background:white colspan=9 |{{small| Wins title of NJKF Featherweight Regular Championship.}}

|-

|- bgcolor=#CCFFCC

| 2007-01-28 || Win ||align=left|{{flagicon|RSA}} Daniel Mashamaite || NJKF "Fighting Evolution II -Muay Thai Open-" || Kōtō, Tokyo, Japan || Decision (Unanimous) || 3 || 3:00 || 12–0

|- bgcolor=#CCFFCC

| 2006-12-05 || Win ||align=left|{{flagicon|THA}} Somdet Por.Pantie || Thai King's Birthday || Sanam Luang, Thailand || KO (Knee shot) || 4 || || 11–0

|-

! style=background:white colspan=9 |{{small|On November 1, 2011, Kubo was sanctioned as the interim NJKF featherweight champion as Nobuhiro Iwai's title had been vacated due to injury.}}

|-

|- bgcolor=#CCFFCC

| 2006-09-16 || Win ||align=left|{{flagicon|THA}} Kenpeth Shinongchai || Rajadamnern Stadium || Bangkok, Thailand || KO || 3 || || 10–0

|- bgcolor=#CCFFCC

| 2006-09-10 || Win ||align=left|{{flagicon|THA}} Nichau Sithaikeriangtor || Rajadamnern Stadium || Bangkok, Thailand || TKO || 3 || || 9–0

|- bgcolor=#CCFFCC

| 2006-05-03 || Win ||align=left|{{flagicon|JPN}} Masato Ōkawa || NJKF "Advance IV" || Bunkyō, Tokyo, Japan || Decision (Unanimous) || 5 || 3:00 || 8–0

|-

! style=background:white colspan=9 |{{small|The elimination match to challenge NJKF Featherweight Championship.}}

|-

|- bgcolor=#CCFFCC

| 2006-03-05 || Win ||align=left|{{flagicon|JPN}} Shōgo Kokubun || NJKF "Advance II" || Bunkyō, Tokyo, Japan || Decision (Unanimous) || 5 || 3:00 || 7–0

|- bgcolor=#CCFFCC

| 2005-11-20 || Win ||align=left|{{flagicon|JPN}} Yoshiaki Takano || NJKF "Infinite Challenge X" || Bunkyō, Tokyo, Japan || TKO (Corner stoppage) || 4 || 2:05 || 6–0

|- bgcolor=#CCFFCC

| 2005-09-24 || Win ||align=left|{{flagicon|JPN}} Shōkō || NJKF "Infinite Challenge VIII" || Bunkyō, Tokyo, Japan || KO (Left high kick) || 1 || 2:52 || 5–0

|- bgcolor=#CCFFCC

| 2005-07-23 || Win ||align=left|{{flagicon|JPN}} Kozaru || NJKF "Infinite Challenge VII" || Bunkyō, Tokyo, Japan || KO || 3 || 1:56 || 4–0

|- bgcolor=#CCFFCC

| 2005-05-03 || Win ||align=left|{{flagicon|JPN}} Hiuma || NJKF "Infinite Challenge IV" || Bunkyō, Tokyo, Japan || Decision (Unanimous) || 3 || 3:00 || 3–0

|- bgcolor=#CCFFCC

| 2005-03-12 || Win ||align=left|{{flagicon|JPN}} Thriller Hideo || NJKF "Infinite Challenge II" || Bunkyō, Tokyo, Japan || Decision (Unanimous) || 3 || 3:00 || 2–0

|- bgcolor=#CCFFCC

| 2005-01-22 || Win ||align=left|{{flagicon|JPN}} Shinji Aseishi || NJKF "Infinite Challenge I" || Bunkyō, Tokyo, Japan || Decision (Unanimous) || 3 || 3:00 || 1–0

|-

| colspan=9 | Legend: {{legend2|#CCFFCC|Win |border=1px solid #CCFFCC}} {{legend2|#FFBBBB|Loss |border=1px solid #FFBBBB}} {{legend2|#c5d2ea|Draw/No contest |border=1px solid #c5d2ea}} {{legend2|White|Notes |border=1px solid #AAAAAA}}

{{end}}

• List of male kickboxers
• List of Krush champions
• List of K-1 champions

{{Reflist}}

• [http://ameblo.jp/kubo-yuta/ Kubo Yuta Official Blog]
• [https://www.twitter.com/kubo_yuta/ Kubo Yuta Official Twitter]
• [https://web.archive.org/web/20100910033121/http://www.k-1.co.jp/en/fighter/player.php?SO=&country=&weight=&weight2=&index=yuta_kubo K-1 Profile]

{{s-start}}

{{s-sports}}

{{Succession box||title=Krush Welterweight Champion|before=Inaugural|after=Masaaki Noiri|years=January 14, 2013–September 1, 2013}}

{{Succession box||title=K-1 World GP Welterweight Champion|before=Inaugural|after=Masaaki Noiri|years=September 18, 2017–August 20, 2020
Vacated}}

{{S-end}}

{{Authority control}}

{{DEFAULTSORT:Kubo, Yuta}}

Category:1987 births

Category:Living people

Category:Japanese male taekwondo practitioners

Category:Japanese male kickboxers

Category:Featherweight kickboxers

Category:Lightweight kickboxers

Category:Japanese male mixed martial artists

Category:Mixed martial artists utilizing taekwondo

Category:Mixed martial artists utilizing kickboxing

Category:People from Tachikawa

Category:Kickboxers from Tokyo