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Japan at the 2018 Summer Youth Olympics

{{missing info|some competitors and results|date=October 2018}}

{{Infobox country at games

|games=Summer Youth Olympics

|games_link=2018 Summer Youth Olympics

|year=2018

|NOC=JPN

|NOCname=Japanese Olympic Committee

|website=http://www.joc.or.jp/

|competitors=96

|sports=23

|flagbearer=Yuka Kagami

|officials=

|location=Buenos Aires, Argentina

|start_date=6

|end_date=18 October 2018

|gold=15

|silver=12

|bronze=12

|rank=3

|appearances= auto

}}

Japan participated at the 2018 Summer Youth Olympics in Buenos Aires, Argentina from 6 October to 18 October 2018. Japan competes in 23 events and brought home 39 medals. It was the rehearsal of the hosting Summer Olympics as Tokyo was the host of the 2020 games which was held from 23 July to 8 August 2021.

Medalists

{{col-begin}}

| style="text-align:left; width:78%; vertical-align:top;"|

class="wikitable sortable" style="font-size:90%"
Medal

! Name

! Sport

! Event

! Date

{{gold medal}}Yuka UenoFencingGirls' foil7 Oct
{{gold medal}}Ramu KawaiDancesportB-Girls'8 Oct
{{gold medal}}Keita DohiSport climbingBoys' combined10 Oct
{{gold medal}}Yu HanagurumaSwimmingBoys' 200 m breaststroke10 Oct
{{gold medal}}Takeru KitazonoGymnasticsBoys' individual all-around11 Oct
{{gold medal}}Wataru SasakiWrestlingBoys' Greco-Roman 51 kg12 Oct
{{gold medal}}Shiori AsabaSwimmingGirls' 200 m breaststroke12 Oct
{{gold medal}}Takeru KitazonoGymnasticsBoys' floor13 Oct
{{gold medal}}Nonoka OzakiWrestlingGirls' freestyle 57 kg13 Oct
{{gold medal}}Yuki Naito
Naoki Tajima		TennisMixed doubles14 Oct
{{gold medal}}Takeru KitazonoGymnasticsBoys' rings14 Oct
{{gold medal}}Takeru KitazonoGymnasticsBoys' parallel bars15 Oct
{{gold medal}}Takeru KitazonoGymnasticsBoys' horizontal bar15 Oct
{{gold medal}}Haruto DeguchiAthleticsBoys' 400 m hurdles16 Ovt
{{gold medal}}Kokoro SakajiKarateGirls' 59 kg17 Oct
{{silver medal}}Shuta TanakaSport climbingBoys' combined10 Oct
{{silver medal}}Miu HiranoTable tennisGirls' singles10 Oct
{{silver medal}}Tomokazu HarimotoTable tennisBoys' singles10 Oct
{{silver medal}}Keisuke YoshidaSwimmingBoys' 800 m freestyle11 Oct
{{silver medal}}Mayuka YamamotoSwimmingGirls' 50 m freestyle12 Oct
{{silver medal}}Yuki Naito
Naho Sato		TennisGirls' doubles13 Oct
{{silver medal}}Miu Hirano
Tomokazu Harimoto		Table tennisMixed team15 Oct
{{silver medal}}Kazuki FurusawaAthleticsBoys' pole vault16 Oct
{{silver medal}}Masaki YamaokaKarateBoys' 61 kg17 Oct
{{silver medal}}Rinka TahataKarateGirls' 53 kg17 Oct
{{silver medal}}Mai Miyamoto
Sara Oino
Yuria Sutoh
Rinka Yokoyama
Ichika Arai
Aki Ikeuchi
Miu Maeda
Mitsuki Kobayashi
Rikako Yamakawa
Mirano Abe		FutsalGirls' tournament17 Oct
{{silver medal}}Sakura SawashimaKarateGirls' 59 kg18 Oct
{{bronze medal}}Keisuke YoshidaSwimmingBoys' 400 m freestyle7 Oct
{{bronze medal}}Shigeyuki NakaraiDancesportB-Boys'8 Oct
{{bronze medal}}Taku TaniguchiSwimmingBoys' 100 m breaststroke8 Oct
{{bronze medal}}Kanami Tanno
Yuma Oshimo		CyclingMixed BMX freestyle park11 Oct
{{bronze medal}}Miku Kojima
Mayuka Yamamoto
Nagisa Ikemoto
Shiori Asaba		SwimmingGirls' 4 × 100 m medley relay11 Oct
{{bronze medal}}Kodai NaraokaBadmintonBoys' singles12 Oct
{{bronze medal}}Shu YamadaWrestlingBoys' Greco-Roman 71 kg12 Oct
{{bronze medal}}Miku Kojima
Taku TaniguchI
Shinnosuke Ishikawa
Nagisa Ikemoto		SwimmingMixed 4 × 100 m medley relay12 Oct
{{bronze medal}}Yuka KagamiWrestlingGirls' freestyle 73 kg13 Oct
{{bronze medal}}Koki WadaAthleticsBoys' long jump15 Oct
{{bronze medal}}Seiryo IkedaAthleticsBoys' 100 m15 Oct
{{bronze medal}}{{columns-list|colwidth=10em|small=yes|style=width:22em|{{ubl|Ryo Eto|Joh Ohba|Ryosuke Kan|Kaito Nakanishi|Kentaro Fujii|Junya Matsumoto|Kippei Ishida|Haruhiko Uemura|Taisei Konishi|Taira Main|Kanji Futamura|Hibiki Yamada}}}}Rugby sevensBoys' tournament15 Oct

| style="text-align:left; width:22%; vertical-align:top;"|

{{Clear}}

class="wikitable" style="font-size:85%; float:right;"
style="background:#efefef;"

!colspan=7|Medals by sport

align=center

|Sport

| style="background:#f7f6a8;"| {{gold01}}

| style="background:#dce5e5;"| {{silver02}}

| style="background:#ffdab9;"| {{bronze03}}

|Total

align=center

|Gymnastics

style="background:#f7f6a8;"| 5style="background:#dce5e5;"| 0style="background:#ffdab9;"| 05
align=center

|Swimming

style="background:#f7f6a8;"| 2style="background:#dce5e5;"| 2style="background:#ffdab9;"| 48
align=center

|Wrestling

style="background:#f7f6a8;"| 2style="background:#dce5e5;"| 0style="background:#ffdab9;"| 24
align=center

|Karate

style="background:#f7f6a8;"| 1style="background:#dce5e5;"| 3style="background:#ffdab9;"| 04
align=center

|Athletics

style="background:#f7f6a8;"| 1style="background:#dce5e5;"| 1style="background:#ffdab9;"| 24
align=center

|Sport climbing

style="background:#f7f6a8;"| 1style="background:#dce5e5;"| 1style="background:#ffdab9;"| 02
align=center

|Tennis

style="background:#f7f6a8;"| 1style="background:#dce5e5;"| 1style="background:#ffdab9;"| 02
align=center

|Dancesport

style="background:#f7f6a8;"| 1style="background:#dce5e5;"| 0style="background:#ffdab9;"| 12
align=center

|Fencing

style="background:#f7f6a8;"| 1style="background:#dce5e5;"| 0style="background:#ffdab9;"| 01
align=center

|Table tennis

style="background:#f7f6a8;"| 0style="background:#dce5e5;"| 3style="background:#ffdab9;"| 03
align=center

|Futsal

style="background:#f7f6a8;"| 0style="background:#dce5e5;"| 1style="background:#ffdab9;"| 01
align=center

|Badminton

style="background:#f7f6a8;"| 0style="background:#dce5e5;"| 0style="background:#ffdab9;"| 11
align=center

|Cycling

style="background:#f7f6a8;"| 0style="background:#dce5e5;"| 0style="background:#ffdab9;"| 11
align=center

|Rugby sevens

style="background:#f7f6a8;"| 0style="background:#dce5e5;"| 0style="background:#ffdab9;"| 11
align=center

!Total

style="background:gold;"| 15style="background:silver;"| 12style="background:#c96;"| 1239

{{col-end}}

Competitors

class="wikitable" style="text-align:center;"
width=200|Sportwidth=60|Boywidth=60|Girlwidth=60|Total
align=left|Archery

| 1

12
align=left|Athletics

| 8

614
align=left|Badminton

| 1

12
align=left|Cycling

| 2

24
align=left|Dancesport

| 1

12
align=left|Fencing

| 2

13
align=left|Futsal

| –

1010
align=left|Golf

| 1

12
align=left|Gymnastics

| 2

35
align=left|Karate

| 3

36
align=left|Modern pentathlon

| 0

11
align=left|Rowing

| 1

01
align=left|Rugby sevens

| 12

–12
align=left|Sailing

| 1

01
align=left|Shooting

| 0

11
align=left|Sport climbing

| 2

13
align=left|Swimming

| 4

48
align=left|Table tennis

| 1

12
align=left|Taekwondo

| 1

01
align=left|Tennis

| 1

23
align=left|Triathlon

| 1

12
align=left|Weightlifting

| 0

11
align=left|Wrestling

| 3

25
Total || 48 || 43 || 91

Archery

{{main|Archery at the 2018 Summer Youth Olympics}}

Japan qualified two archers based on its performance at the 2017 World Archery Youth Championships.{{cite news | url=https://extranet.worldarchery.org/documents/index.php/Events/Olympic_Games/2018_Buenos_Aires_YOG/BA_2018_Qualification_Boys.pdf | title=YOG 2018 Qualification Places – Boys | work=World Archery Federation | access-date=15 December 2017}}{{cite news | url=https://extranet.worldarchery.org/documents/index.php/Events/Olympic_Games/2018_Buenos_Aires_YOG/BA_2018_Qualification_Girls.pdf | title=YOG 2018 Qualification Places – Girls | work=World Archery Federation | access-date=15 December 2017}}

;Individual

class="wikitable" style="font-size:90%;"
rowspan="2"|Athlete

!rowspan="2"|Event

!colspan="2"|Ranking round

!Round of 32

!Round of 16

!Quarterfinals

!Semifinals

!Final / {{abbr|BM|Bronze medal match}}

!rowspan=2|Rank

style="font-size:95%"

!Score

!Seed

!Opposition
Score

!Opposition
Score

!Opposition
Score

!Opposition
Score

!Opposition
Score

align=center

|align=left|Tetsuya Aoshima

|Boys' Individual

|654

|22

|{{flagIOC2athlete|Tolba|EGY|2018 Summer Youth Olympics}}
L 5–6

|colspan=4|did not advance

|17

align=center

|align=left|Ruka Uehara

|Girls' Individual

|667

|2

|{{flagIOC2athlete|Jones|NZL|2018 Summer Youth Olympics}}
L 5–6

|colspan=4|did not advance

|17

;Team

class="wikitable" style="font-size:90%;"
rowspan="2"|Athletes

!rowspan="2"|Event

!colspan="2"|Ranking round

!Round of 32

!Round of 16

!Quarterfinals

!Semifinals

!Final / {{abbr|BM|Bronze medal match}}

!rowspan=2|Rank

style="font-size:95%"

!Score

!Seed

!Opposition
Score

!Opposition
Score

!Opposition
Score

!Opposition
Score

!Opposition
Score

align=center

|align=left|{{flagIOC2athlete|Tetsuya Aoshima|JPN|2018 Summer Youth Olympics}}
{{flagIOC2athlete|Èlia Canales|ESP|2018 Summer Youth Olympics}}

|rowspan=2|Mixed team

|1299

|19

|{{flagIOC2athlete|Naumova|UKR|2018 Summer Youth Olympics}}
{{flagIOC2athlete|Eyeni|CIV|2018 Summer Youth Olympics}}
L 4–5

|colspan=4|did not advance

| 17

align=center

|align=left|{{flagIOC2athlete|Ruka Uehara|JPN|2018 Summer Youth Olympics}}
{{flagIOC2athlete|Louis Gino Aurelien Juhel|MRI|2018 Summer Youth Olympics}}

|1273

|30

|{{flagIOC2athlete|Kharitonova|RUS|2018 Summer Youth Olympics}}
{{flagIOC2athlete|Rezowan|BAN|2018 Summer Youth Olympics}}
L 4–5

|colspan=4|did not advance

| 17

Athletics

{{main|Athletics at the 2018 Summer Youth Olympics}}

{{cite news |title=第3回ユースオリンピック競技大会 陸上競技日本代表内定選手団|url=https://www.jaaf.or.jp/files/competition/document/1285-6.pdf|publisher=Japan Association of Athletics Federations |date=5 July 2018|access-date=8 September 2018|language=ja}}

;Boys

;Track & road events

class=wikitable style="font-size:90%"
rowspan="2"|Athlete

!rowspan="2"|Event

!colspan="2"|Stage 1

!colspan="2"|Stage 2

!colspan="2"|Total

style="font-size:95%"

!Time

!Rank

!Time

!Rank

!Time

!Rank

align=center

|align=left|Seiryo Ikeda

|align=left|100 m

|10.82

|3

|10.30

|3

|21.12

|{{bronze03}}

align=center

|align=left|Kosuke Ishida

|align=left|1500 m

|3:57.25

|11

|11:52{{ref label|a|a|a}}

|5

|16

|7

align=center

|align=left|Rintaro Kajiyama

|align=left|3000 m

|8:22.15

|5

|12:10{{ref label|a|a|a}}

|8

|13

|6

align=center

|align=left|Haruto Deguchi

|align=left|400 m hurdles

|51.40

|1

|51.28

|1

|1:42.68

|{{gold01}}

align=center

|align=left|Yusuke Iwakawa

|align=left|5000 m walk

|21:49.40

|10

|23:20.84

|12

|45:10.24

|12

;Field Events

class=wikitable style="font-size:90%"
rowspan="2"|Athlete

!rowspan="2"|Event

!colspan="2"|Stage 1

!colspan="2"|Stage 2

!colspan="2"|Total

style="font-size:95%"

!Time

!Rank

!Time

!Rank

!Time

!Rank

align=center

|align=left|Kazuki Furusawa

|align=left|Pole vault

|5.10

|3

|5.22

|2

|10.32

|{{silver02}}

align=center

|align=left|Koki Wada

|align=left|Long jump

|7.46

|4

|7.66

|3

|15.12

|{{bronze03}}

align=center

|align=left|Kentaro Nakamura

|align=left|Javelin throw

|66.31

|13

|64.55

|12

|130.86

|12

;Girls

;Track & road events

class=wikitable style="font-size:90%"
rowspan="2"|Athlete

!rowspan="2"|Event

!colspan="2"|Stage 1

!colspan="2"|Stage 2

!colspan="2"|Total

style="font-size:95%"

!Time

!Rank

!Time

!Rank

!Time

!Rank

align=center

|align=left|Takako Niisaka

|align=left|100 m

|12.22

|7

|11.65

|8

|23.87

|8

align=center

|align=left|Maki Ueda

|align=left|800 m

|2:09.91

|8

|2:10.06

|5

|4:19.97

|7

align=center

|align=left|Yuki Kanemitsu

|align=left|1500 m

|4:24.41

|4

|13:13{{ref label|a|a|a}}

|3

|7

|4

align=center

|align=left|Miyaka Sugata

|align=left|3000 m

|9:21.16

|5

|13:59{{ref label|a|a|a}}

|11

|16

|9

;Field Events

class=wikitable style="font-size:90%"
rowspan="2"|Athlete

!rowspan="2"|Event

!colspan="2"|Stage 1

!colspan="2"|Stage 2

!colspan="2"|Total

style="font-size:95%"

!Time

!Rank

!Time

!Rank

!Time

!Rank

align=center

|align=left|Azuki Nakatsugawa

|align=left|Long jump

|5.86

|6

|6.14

|5

|12.00

|5

align=center

|align=left|Yuika Nakamura

|align=left|Javelin throw

|43.62

|14

|DNS

| -

| -

| -

{{note label|a|a|a}} Cross Country

Badminton

{{main|Badminton at the 2018 Summer Youth Olympics}}

Japan qualified two players based on the Badminton Junior World Rankings.{{cite web|title=BWF Junior World Ranking – Boys Invited to 2018 Youth Olympics|url=http://cms.bwfbadminton.com/wp-content/uploads/2018/05/Youth-Olympic-Qualifiers-MS-updated-9-May.pdf|website=BWF Corporate|access-date=19 May 2018}}{{cite web|title=BWF Junior World Ranking – Girls Invited to 2018 Youth Olympics|url=http://cms.bwfbadminton.com/wp-content/uploads/2018/05/Youth-Olympic-Qualifiers-WS-updated-9-May.pdf|website=BWF Corporate|access-date=19 May 2018}}

;Singles

class="wikitable" style="font-size:90%"
rowspan=2|Athlete

!rowspan=2|Event

!colspan=4|Group Stage

!Quarterfinal

!Semifinal

!colspan=2|Final / {{abbr|BM|Bronze medal match}}

style="font-size:95%"

!Opposition
Score

!Opposition
Score

!Opposition
Score

!Rank

!Opposition
Score

!Opposition
Score

!Opposition
Score

!Rank

align=center

|align=left|Kodai Naraoka

|align=left|Boys' singles

|{{flagIOCathlete|Chang Ho Kim|FIJ|2018 Summer Youth}}
W (21–7, 21–5)

|{{flagIOCathlete|Cristian Savin|MDA|2018 Summer Youth}}
W (21–8, 21–13)

|{{flagIOCathlete|Dmitriy Panarin|KAZ|2018 Summer Youth}}
W (21–9, 21–12)

|1 Q

|{{flagIOCathlete|Chen Shiau-cheng|TPE|2018 Summer Youth}}
W (21–11, 21–11)

|{{flagIOCathlete|Lakshya Sen|IND|2018 Summer Youth}}
L (21–14, 15–21, 22–24)

|{{flagIOCathlete|Arnaud Merklé|FRA|2018 Summer Youth}}
W (21–17, 24–26, 22–20)

|{{bronze03}}

align=center

|align=left|Hirari Mizui

|align=left|Girls' singles

|{{flagIOCathlete|Léonice Huet|FRA|2018 Summer Youth}}
W (21–14, 21–16)

|{{flagIOCathlete|Halla Bouksani|ALG|2018 Summer Youth}}
W (21–1, 21–9)

|{{flagIOCathlete|Wang Zhiyi|CHN|2018 Summer Youth}}
L (10–21, 21–17, 16–21)

|2

|colspan=3|did not advance

|9

;Team

class="wikitable" style="font-size:90%"
rowspan=2|Athlete

!rowspan=2|Event

!colspan=4|Group stage

!Quarterfinal

!Semifinal

!Final / {{abbr|BM|Bronze medal match}}

!rowspan=2|Rank

style="font-size:95%"

!Opposition
Score

!Opposition
Score

!Opposition
Score

!Rank

!Opposition
Score

!Opposition
Score

!Opposition
Score

align=center

|align=left|Team Theta
{{flagIOCathlete|Kodai Naraoka|JPN|2018 Summer Youth}}
{{flagIOCathlete|Hirari Mizui|JPN|2018 Summer Youth}}
{{flagIOCathlete|Julien Carraggi|BEL|2018 Summer Youth}}
{{flagIOCathlete|Mohamed Mostafa Kamel|EGY|2018 Summer Youth}}
{{flagIOCathlete|Lukas Resch|GER|2018 Summer Youth}}
{{flagIOCathlete|Zecily Fung|AUS|2018 Summer Youth}}
{{flagIOCathlete|Jaqueline Lima |BRA|2018 Summer Youth}}
{{flagIOCathlete|Tereza Švábíková|CZE|2018 Summer Youth}}

|align=left|Mixed Teams

|{{flagIOCathlete|Sigma|MIX|2018 Summer Youth}}
L (100–110)

|{{flagIOCathlete|Omega|MIX|2018 Summer Youth}}
L (100–110)

|{{flagIOCathlete|Gamma|MIX|2018 Summer Youth}}
L (107–110)

|4Q

|{{flagIOCathlete|Delta|MIX|2018 Summer Youth}}
W (110–93)

|{{flagIOCathlete|Alpha|MIX|2018 Summer Youth}}
L (90–110)

|{{flagIOCathlete|Zeta|MIX|2018 Summer Youth}}
W (110–107)

|{{bronze03}}

Cycling

{{main|Cycling at the 2018 Summer Youth Olympics}}

Japan qualified a boys' and girls' combined team based on its ranking in the Youth Olympic Games Junior Nation Rankings. They also qualified a mixed BMX racing team based on its ranking in the Youth Olympic Games BMX Junior Nation Rankings and two athletes in BMX freestyle based on its performance at the 2018 Urban Cycling World Championship.{{cite news | url= http://www.uci.ch/mm/Document/News/News/18/63/12/CountriesthatwillparticipateintheYouthOlympicGamesBuenosAires2018forcycling_English.pdf | title=Countries that will participate in the 2018 Youth Olympics | work=UCI | date=1 June 2018 | access-date=1 June 2018}}

  • Boys' combined team – 1 team of 2 athletes
  • Girls' combined team – 1 team of 2 athletes
  • Mixed BMX racing team – 1 team of 2 athletes
  • Mixed BMX freestyle – 1 boy and 1 girl

Dancesport

{{main|Dancesport at the 2018 Summer Youth Olympics}}

Japan qualified two dancers based on its performance at the 2018 World Youth Breaking Championship.{{cite news | url=https://www.worlddancesport.org/Blog/Live_From/2018_World_Breaking_-_U-21_-_S2-3S_-_BW/Japan_Too-7347 | title=Japan Too! | work=World DanceSport Federation | date=20 May 2018 | access-date=21 May 2018 | archive-date=11 January 2021 | archive-url=https://web.archive.org/web/20210111174927/http://www.worlddancesport.org/Blog/Live_From/2018_World_Breaking_-_U-21_-_S2-3S_-_BW/Japan_Too-7347 | url-status=dead }}{{cite news | url=https://www.worlddancesport.org/Blog/Live_From/2018_World_Breaking_-_U-21_-_S2-3S_-_BW/The_Winners_Are_...-7346 | title=The Winners Are... | work=World DanceSport Federation | date=20 May 2018 | access-date=21 May 2018 | archive-date=11 January 2021 | archive-url=https://web.archive.org/web/20210111195451/https://www.worlddancesport.org/Blog/Live_From/2018_World_Breaking_-_U-21_-_S2-3S_-_BW/The_Winners_Are_...-7346 | url-status=dead }}

  • B-Boys – Shigekix
  • B-Girls – Ram

Fencing

{{main|Fencing at the 2018 Summer Youth Olympics}}

Japan qualified three athletes based on its performance at the 2018 Cadet World Championship.{{cite news|url=http://static.fie.org/uploads/19/96340-JOG%202018%20athletes%20qualified.pdf |title=2018 Youth Olympic Games – Buenos Aires FIE Qualifications |work=FIE |date=10 April 2018 |access-date=14 May 2018 }}

class="wikitable" style="font-size:90%"
rowspan=2|Athlete

!rowspan=2|Event

!colspan=7|Group Stage

!Round of 16

!Quarterfinals

!Semifinals

!colspan=2|Final / {{abbr|BM|Bronze medal match}} / {{abbr|FM|5th/6th Place match}}

style="font-size:95%"

!Opposition
Score

!Opposition
Score

!Opposition
Score

!Opposition
Score

!Opposition
Score

!Opposition
Score

!Rank

!Opposition
Score

!Opposition
Score

!Opposition
Score

!Opposition
Score

!Rank

align=center

|align=left|Seiya Asami

|align=left|Boys' épée

|{{flagIOCathlete|Ignacio Pérez Contreras|ARG|2018 Summer Youth}}
W (5–1)

|{{flagIOCathlete|Khasan Baudunov|KGZ|2018 Summer Youth}}
L (3–4)

|{{flagIOCathlete|Paul Veltrup|GER|2018 Summer Youth}}
L (2–5)

|{{flagIOCathlete|Seraphim Hsieh Jarov|CAN|2018 Summer Youth}}
W (5–3)

|{{flagIOCathlete|Artur Tolasov|RUS|2018 Summer Youth}}
W (5–1)

| {{n/a}}

|2

| {{n/a}}

|{{flagIOCathlete|Khasan Baudunov|KGZ|2018 Summer Youth}}
L (1–5)

|colspan="2" align=center|Did not advance

|6

align=center

|align=left|Hibiki Kato

|align=left|Boys' sabre

|{{flagIOCathlete|Samuel Jarry|FRA|2018 Summer Youth}}
L (1–5)

|{{flagIOCathlete|Andrei Păștin|ROU|2018 Summer Youth}}
W (5–1)

|{{flagIOCathlete|Matias Ríos|ARG|2018 Summer Youth}}
W (5–1)

|{{flagIOCathlete|Hudson Santana|PUR|2018 Summer Youth}}
L (4–5)

|{{flagIOCathlete|Alonso Santamaría|ESP|2018 Summer Youth}}
L (3–5)

| {{n/a}}

|4

|{{flagIOCathlete|Amirhossein Shaker|IRI|2018 Summer Youth}}
W (15–9)

|{{flagIOCathlete|Hyun Jun|KOR|2018 Summer Youth}}
L (12–15)

|colspan="2" align=center|Did not advance

|8

align=center

|align=left|Yuka Ueno

|align=left|Girls' foil

|{{flagIOCathlete|Giorgia Salmas|AUS|2018 Summer Youth}}
W (5–0)

|{{flagIOCathlete|Venissia Thépaut|FRA|2018 Summer Youth}}
W (5–3)

|{{flagIOCathlete|Rebeca Cândescu|ROU|2018 Summer Youth}}
W (5–1)

|{{flagIOCathlete|Christelle Joy Ko|HKG|2018 Summer Youth}}
W (5–1)

|{{flagIOCathlete|Anabella Acurero|VEN|2018 Summer Youth}}
W (5–0)

|{{flagIOCathlete|Noha Hany|EGY|2018 Summer Youth}}
W (5–1)

|1

| {{n/a}}

|{{flagIOCathlete|Christelle Joy Ko|HKG|2018 Summer Youth}}
W (13–3)

|{{flagIOCathlete|Anabella Acurero|VEN|2018 Summer Youth}}
W (8–4)

|{{flagIOCathlete|Martina Favaretto|ITA|2018 Summer Youth}}
W (15–12)

| {{gold01}}

Futsal

{{main|Futsal at the 2018 Summer Youth Olympics}}

;Girls{{cite news | url=http://www.jfa.jp/eng/news/00018854/ | title=U-18 Japan Women's Futsal National Team squad, schedule – The 3rd Youth Olympic Futsal Tournament Buenos Aires 2018 (9/28-10/21) | work=JFA | date=19 September 2018 | access-date=20 September 2018}}

;Summary

class=wikitable style=font-size:90%;text-align:center

!rowspan=2|Team

!rowspan=2|Event

!colspan=5|Group Stage

!Semifinal

!colspan=2|Final / {{abbr|BM|Bronze medal game}}

style=font-size:95%

!Opposition
score

!Opposition
score

!Opposition
score

!Opposition
score

!Rank

!Opposition
score

!Opposition
score

!Rank

align=left|Japan

|align=left|Girls' tournament

|{{CMR}}
W 6–2

|{{CHI}}
W 4–1

|{{DOM}}
W 6–2

|{{POR}}
L 0–2

|2

|{{ESP}}
W 3–2

|{{PRT}}
L 1–4

|{{silver02}}

;Group D

{{#section:Futsal at the 2018 Summer Youth Olympics – Girls' tournament|Group D}}

{{#section:Futsal at the 2018 Summer Youth Olympics – Girls' tournament|D3}}

{{#section:Futsal at the 2018 Summer Youth Olympics – Girls' tournament|D5}}

{{#section:Futsal at the 2018 Summer Youth Olympics – Girls' tournament|D7}}

{{#section:Futsal at the 2018 Summer Youth Olympics – Girls' tournament|D10}}

;Semi-finals

{{#section:Futsal at the 2018 Summer Youth Olympics – Girls' tournament|SF2}}

;Finals

{{#section:Futsal at the 2018 Summer Youth Olympics – Girls' tournament|GM}}

Golf

{{main|Golf at the 2018 Summer Youth Olympics}}

;Individual

class="wikitable" style="font-size:90%"

!rowspan="2"|Athlete

!rowspan="2"|Event

!colspan="2"|Round 1

!colspan="3"|Round 2

!colspan="3"|Round 3

!colspan="3"|Total

style="font-size:95%"

!Score

!Rank

!Score

!Total

!Rank

!Score

!Total

!Rank

!Score

!Par

!Rank

align=center

|align=left|Kagetsu Tsuruse

|align=left |Girls' Individual

|79 (+9)

|22

|77 (+7)

|156

|19

|79 (+9)

|235

|28

|235

| +25

|27

align=center

|align=left|Ryou Hitsatsune

|align=left |Boys' Individual

|75 (+5)

|20

|68 (-2)

|143

|1

|70 (0)

|213

|4

|213

| +3

|5

;Team

class="wikitable" style="font-size:90%"

!rowspan="2"|Athletes

!rowspan="2"|Event

!colspan="2"|Round 1
(Fourball)

!colspan="2"|Round 2
(Foursome)

!colspan="4"|Round 3
(Individual Stroke)

!colspan="3"|Total

style="font-size:95%"

!Score

!Rank

!Score

!Rank

!Girl

!Boy

!Total

!Rank

!Score

!Par

!Rank

align=center

|align=left|Kagetsu Tsuruse
Ryou Hitsatsune

|align=left |Mixed team

|64 (-6)

|6

|74 (+4)

|15

|76

|70

|146 (+6)

|11

|284

| +4

|9

Gymnastics

{{main|Gymnastics at the 2018 Summer Youth Olympics}}

=Artistic=

Japan qualified two gymnasts based on its performance at the 2018 Asian Junior Championship.{{cite news | url= http://www.fig-gymnastics.com/site/site/download?fileId=6654| title=2018 Youth Olympic Games Gymnastics Qualifiers | work=FIG | date=25 June 2018 | access-date=26 June 2018}}

class="wikitable" style="font-size:90%"
rowspan=2|Athlete

!rowspan=2|Event

!colspan =6|Apparatus

!rowspan=2|Total

!rowspan=2|Rank

style="font-size:95%"

!{{Tooltip| F | Floor}}

!{{Tooltip| PH | Pommel horse }}

!{{Tooltip| R | Rings}}

!{{Tooltip| V | Vault}}

!{{Tooltip| PB | Parallel bars}}

!{{Tooltip| HB | Horizontal bar}}

align=center

|align=left rowspan=7|Takeru Kitazono

|align=left|Qualification

|13.500

|14.133

|13.700

|14.100

|14.266

|13.600

|83.299

|1 Q

align=center

|align=left|All-around

|13.833

|13.966

|13.466

|14.233

|13.000

|13.800

|83.299

|{{gold01}}

align=center

|align=left|Floor

|colspan=6 rowspan=5 {{n/a

}

|13.633

|{{gold01}}

|- align=center

|align=left|Parallel bars

|12.666

|6

|- align=center

|align=left|Rings

|13.533

|{{gold01}}

|- align=center

|align=left|Parallel bars

|14.166

|{{gold01}}

|- align=center

|align=left|Horizontal bar

|13.566

|{{gold01}}

|}

class="wikitable" style="font-size:90%"
rowspan=2|Athlete

!rowspan=2|Event

!colspan =4|Apparatus

!rowspan=2|Total

!rowspan=2|Rank

style="font-size:95%"

!{{Tooltip| V | Vault}}

!{{Tooltip| UB | Uneven bars}}

!{{Tooltip| BB | Balance beam}}

!{{Tooltip| F | Floor}}

align=center

|align=left rowspan=2|Chiharu Yamada

|align=left|Qualification

|13.100

|9.733

|11.166

|12.566

|46.565

|21

align=center

|align=left|Floor

|colspan=4 {{n/a

}

|12.000

|6

|}

=Rhythmic=

Japan qualified one gymnast based on its performance at the 2018 Asian Junior Championship.

;Individual

class=wikitable style="font-size:90%"
rowspan=2|Athlete

!rowspan=2|Event

!colspan=6|Qualification

!colspan=6|Final

style="font-size:95%"

!Hoop

!Ball

!Clubs

!Ribbon

!Total

!Rank

!Hoop

!Ball

!Clubs

!Ribbon

!Total

!Rank

align=center

|align=left|Aino Yamada

|align=left|Individual

|14.900

|14.850

|15.450

|14.250

|59.450

|6 Q

|15.500

|15.300

|15.000

|12.400

|58.200

|8

=Trampoline=

Japan qualified two gymnasts based on its performance at the 2018 Asian Junior Championship.

  • Boys' trampoline – 1 quota
  • Girls' trampoline – 1 quota

class="wikitable" style="font-size:90%"
rowspan="2"|Athlete

!rowspan="2"|Event

!colspan="4"|Qualification

!colspan="2"|Final

style="font-size:95%"

!Routine 1

!Routine 2

!Total

!Rank

!Score

!Rank

align=center

|align=left|Takumi Fujimoto

|align=left|Boys

|

|

|50.975

|12

|colspan="2" align=center|Did not advance

align=center

|align=left|Yuki Okuno

|align=left|Girls

|42.440

|50.395

|92.835

|6 Q

|50.760

|5

Karate

{{main|Karate at the 2018 Summer Youth Olympics}}

Japan qualified three athlete based on the rankings in the Buenos Aires 2018 Olympic Standings.{{cite news | url= https://www.wkf.net/news-center-new/karate-powerhouses-lead-standings-for-youth-olympic-games/727/ | title=Karate powerhouses lead standings for Youth Olympic Games | work=World Karate Federation | date=1 June 2018 | access-date=2 June 2018}} Later, they qualified three more athletes based on its performance at one of the Karate Qualification Tournaments.{{cite news | url= https://www.wkf.net/news-center-new/youth-olympic-qualifier-concludes-in-umag-with-new-karatekas-making-it-to-buenos-aires-2018/749/ | title=Youth Olympic qualifier concludes in Umag with new karatekas making it to Buenos Aires 2018 | work=World Karate Federation | date=1 July 2018 | access-date=1 July 2018}}

class="wikitable" style="font-size:90%"
rowspan=2|Athlete

!rowspan=2|Event

!colspan=4|Group Stage

!colspan=1|Semifinal

!colspan=2|Final / {{abbr|BM|Bronze medal match}}

style="font-size:95%"

!Opposition
Score

!Opposition
Score

!Opposition
Score

!Rank

!Opposition
Score

!Opposition
Score

!Rank

align=center

|align=left|Masaki Yamaoka

|align=left|Boys' 61 kg

|{{flagIOCathlete|Pedropablo de la Roca|GUA|2018 Summer Youth}}
W (4–0)

|{{flagIOCathlete|Alireza Farajikouhikheili|IRI|2018 Summer Youth}}
W (5–0)

|{{flagIOCathlete|Oussama Edari|MAR|2018 Summer Youth}}
D (0–0)

|1

|{{flagIOCathlete|Fahik Veseli|MKD|2018 Summer Youth}}
W (8–0)

|{{flagIOCathlete|Mohammed Al-Assiri|KSA|2018 Summer Youth}}
L (0–8)

|{{silver02}}

align=center

|align=left|Kotaro Nakamura

|align=left|Boys' 68 kg

|{{flagIOCathlete|Yassine Sekouri|MAR|2018 Summer Youth}}
L (2–8)

|{{flagIOCathlete|Abilmansur Batyrgali|KAZ|2018 Summer Youth}}
L (0–3)

|{{flagIOCathlete|Juan Salsench|ARG|2018 Summer Youth}}
D (0–0)

|3

|colspan="3" align=center|Did not advance

align=center

|align=left|Keisei Sakiyama

|align=left|Boys' +68 kg

|{{flagIOCathlete|Tomáš Kósa|SVK|2018 Summer Youth}}
W (1–0)

|{{flagIOCathlete|Navid Mohammadi|IRI|2018 Summer Youth}}
W (2–0)

|{{flagIOCathlete|Sean McCarthy Crean|IRL|2018 Summer Youth}}
L (1–2)

|3

|colspan="3" align=center|Did not advance

align=center

|align=left|Rinka Tahata

|align=left|Girls' 53 kg

|{{flagIOCathlete|Aika Okazaki|THA|2018 Summer Youth}}
D (3–3)

|{{flagIOCathlete|Tânia de Barros|POR|2018 Summer Youth}}
W (2–0)

|{{flagIOCathlete|Fatemeh Khonakdartarsi|IRI|2018 Summer Youth}}
W (1–0)

|1

|{{flagIOCathlete|Dildora Alikulova|UZB|2018 Summer Youth}}
W (2–0)

|{{flagIOCathlete|Yasmin Nasr Elgewily|EGY|2018 Summer Youth}}
L (1–2)

|{{silver02}}

align=center

|align=left|Kokoro Sakaji

|align=left|Girls' 59 kg

|{{flagIOCathlete|Marta Ossipova|EST|2018 Summer Youth}}
W (4–0)

|{{flagIOCathlete|Zsófia Baranyi|HUN|2018 Summer Youth}}
W (1–0)

|{{flagIOCathlete|Ivana Perović|SRB|2018 Summer Youth}}
W (1–0)

|1

|{{flagIOCathlete|Mobina Heydariozomcheloei|IRI|2018 Summer Youth}}
D (0–0)

|{{flagIOCathlete|Anna Chernysheva|RSA|2018 Summer Youth}}
W (3–0)

|{{gold01}}

align=center

|align=left|Sakura Sawashima

|align=left|Girls' +59 kg

|{{flagIOCathlete|Laura Lyck|DEN|2018 Summer Youth}}
W (2–0)

|{{flagIOCathlete|Negin Altooni|IRI|2018 Summer Youth}}
L (1–5)

|{{flagIOCathlete|Janessa Fonseca|PUR|2018 Summer Youth}}
W (3–0)

|1

|{{flagIOCathlete|Lauren Salisbury|GBR|2018 Summer Youth}}
W (9–1)

|{{flagIOCathlete|Annika Sælid|NOR|2018 Summer Youth}}
L (0–3)

|{{silver02}}

Modern pentathlon

{{main|Modern pentathlon at the 2018 Summer Youth Olympics}}

Rowing

{{main|Rowing at the 2018 Summer Youth Olympics}}

Japan qualified one boat based on its performance at the 2018 Asian Youth Olympic Games Qualification Regatta.{{cite news|url= http://www.worldrowing.com/mm//Document/General/General/13/02/35/YOGconfirmed31102017_Neutral.pdf| title=2018 Youth Olympic Games Rowing Places Obtained | work=FISA | date=30 October 2017 | access-date=10 November 2017}}

  • Boys' single sculls – 1 athlete

Rugby sevens

{{main|Rugby sevens at the 2018 Summer Youth Olympics}}

=Boys' tournament=

{{main article|Rugby sevens at the 2018 Summer Youth Olympics – Boys' tournament}}

;Summary

class=wikitable style=font-size:90%;text-align:center

!rowspan=2|Team

!rowspan=2|Event

!colspan=6|Group Stage

!colspan=2|Bronze medal game

style=font-size:95%

!Opposition
score

!Opposition
score

!Opposition
score

!Opposition
score

!Opposition
score

!Rank

!Opposition
score

!Rank

align=left|Japan

|align=left|Boys' tournament

|{{RSA}}
W 14–12

|{{ARG}}
L 0–45

|{{SAM}}
W 29–0

|{{USA}}
D 17–17

|{{FRA}}
L 14–29

|3

|{{RSA}}
W 28–5

|{{bronze03}}

;Group Stage

{{#invoke:Sports table|main|style=WDL

|source=[https://www.buenosaires2018.com/results/resYOG2018/pdf/YOG2018/RUG/YOG2018_RUG_C76_RUGMTEAM7-------------------------.pdf Buenos Aires 2018]

|for_against_style=points

|winpoints=3 |drawpoints=2 |losspoints=1

|name_ARG={{flagIOC|ARG|2018 Summer Youth}}

|name_FRA={{flagIOC|FRA|2018 Summer Youth}}

|name_JPN={{flagIOC|JPN|2018 Summer Youth}}

|name_SAM={{flagIOC|SAM|2018 Summer Youth}}

|name_RSA={{flagIOC|RSA|2018 Summer Youth}}

|name_USA={{flagIOC|USA|2018 Summer Youth}}

|update=complete

|win_ARG=5 |draw_ARG=0 |loss_ARG=0 |pf_ARG=180 |pa_ARG=38

|win_FRA=4 |draw_FRA=0 |loss_FRA=1 |pf_FRA=111 |pa_FRA=65

|win_JPN=2 |draw_JPN=1 |loss_JPN=2 |pf_JPN=74 |pa_JPN=103

|win_RSA=2 |draw_RSA=0 |loss_RSA=3 |pf_RSA=79 |pa_RSA=84

|win_USA=0 |draw_USA=2 |loss_USA=3 |pf_USA=67 |pa_USA=120

|win_SAM=0 |draw_SAM=1 |loss_SAM=4 |pf_SAM=48 |pa_SAM=149

|team1=ARG |team2=FRA |team3=JPN |team4=RSA |team5=USA |team6=SAM

|class_rules = 1) Points; 2) Head-to-head result; 3) Point difference; 4) Points scored.

}}

{{rugbybox

|bg=

|date={{dts|format=dmy|2018|10|13}}

|time=13:15

|home={{flagIOC-rt|RSA|2018 Summer Youth}}

|score=12–14

|away={{flagIOC|JPN|2018 Summer Youth}}

|report=[https://www.buenosaires2018.com/results/resYOG2018/pdf/YOG2018/RUG/YOG2018_RUG_C73_RUGMTEAM7-------------GPA-000100--.pdf Report]

|try1=Maubane 3'c
Kellerman 7'm

|con1=Hattingh (1/2) 3'

|try2=Nakanishi 6'c
Konishi 11'c

|con2=Yamada (2/2) 7', 12'

|stadium=Club Atlético San Isidro, Buenos Aires

|referee=Nehuen Jauri Rivero (Argentina)

}}

{{rugbybox

|bg=

|date={{dts|format=dmy|2018|10|13}}

|time=17:10

|home={{flagIOC-rt|ARG|2018 Summer Youth}}

|score=45–0

|away={{flagIOC|JPN|2018 Summer Youth}}

|report=[https://www.buenosaires2018.com/results/resYOG2018/pdf/YOG2018/RUG/YOG2018_RUG_C73_RUGMTEAM7-------------GPA-000600--.pdf Report]

|try1=Cinti Luna (2) 2'c, 9'c
Vanni 4'm
González 6'c
Mendy 8'c
Graziano 11'm
Moneta 13'c

|con1=Roger (2/3) 3', 6'
Elicagaray (3/4) 8', 9', 13'

|stadium=Club Atlético San Isidro, Buenos Aires

|referee=Francisco González (Uruguay)

}}

{{rugbybox

|bg=

|date={{dts|format=dmy|2018|10|14}}

|time=10:05

|home={{flagIOC-rt|JPN|2018 Summer Youth}}

|score=29–0

|away={{flagIOC|SAM|2018 Summer Youth}}

|report=[https://www.buenosaires2018.com/results/resYOG2018/pdf/YOG2018/RUG/YOG2018_RUG_C73_RUGMTEAM7-------------GPA-000900--.pdf Report]

|try1=Fujii (3) 0'm, 1'm, 4'c
Konishi 10'c
Nakanishi 13'm

|con1=Yamada (2/5) 5', 10'

|stadium=Club Atlético San Isidro, Buenos Aires

|referee=Damián Schneider (Argentina)

}}

{{rugbybox

|bg=

|date={{dts|format=dmy|2018|10|14}}

|time=12:45

|home={{flagIOC-rt|USA}}

|score=17–17

|away={{flagIOC|JPN}}

|report=[https://www.buenosaires2018.com/results/resYOG2018/pdf/YOG2018/RUG/YOG2018_RUG_C73_RUGMTEAM7-------------GPA-001100--.pdf Report]

|try1=Sione 3'c
Kruse 10'm
Green 13'm

|con1=Sione (1/3) 3'

|try2=Konishi 4'c
Nakanashi 6'm
Yamada 8'm

|con2=Konishi (1/1) 5'
Ishida (0/1)
Uemura (0/1)

|stadium=Club Atlético San Isidro, Buenos Aires

|referee=Nehuen Jauri Rivero (Argentina)

}}

{{rugbybox

|bg=

|date={{dts|format=dmy|2018|10|15}}

|time=11:55

|home={{flagIOC-rt|FRA}}

|score=29–14

|away={{flagIOC|JPN}}

|report=[https://www.buenosaires2018.com/results/resYOG2018/pdf/YOG2018/RUG/YOG2018_RUG_C73_RUGMTEAM7-------------GPA-001500--.pdf Report]

|try1=Dridi 1'c
Dulon 4'm
Randle 6'c
Trouabal 11'm
Tani 13'm

|con1=Bellot (1/2) 2'
Tiberghien (1/2) 7'
Germain (0/1)

|try2=Konishi 3'c
Fujii 9'c

|con2=Konishi (1/1) 4'
Yamada (1/1) 9'

|stadium=Club Atlético San Isidro, Buenos Aires

|referee=Paulo Duarte (Portugal)

}}

;Bronze medal match

{{rugbybox

|bg=

|date={{dts|format=dmy|2018|10|15}}

|time=15:10

|home={{flagIOC-rt|JPN|2018 Summer Youth}}

|score=28–5

|away={{flagIOC|RSA|2018 Summer Youth}}

|report=[https://www.buenosaires2018.com/results/resYOG2018/pdf/YOG2018/RUG/YOG2018_RUG_C73_RUGMTEAM7-------------FNL-000200--.pdf Report]

|try1=Fujii 2'c
Nakanishi 3'c
Konishi (2) 8'c, 12'c

|con1=Konishi (4/4) 2', 3', 9', 12'

|try2=Maubane 13'm

|con2=Braude (0/1)

|stadium=Club Atlético San Isidro, Buenos Aires

|referee=Damián Schneider (Argentina)

}}

Sailing

{{main|Sailing at the 2018 Summer Youth Olympics}}

Japan qualified one boat based on its performance at the 2018 Singapore Open (Asian Techno 293+ Qualifiers).{{cite news | url=http://sailing.org.sg/sailwave/2018/SIN_WSF_Open.htm | title=Singapore Open 2018 Windsurfing Competition | work=Singapore Sailing | date=11 February 2018 | access-date=3 August 2017 | archive-url=https://web.archive.org/web/20180212201648/http://sailing.org.sg/sailwave/2018/SIN_WSF_Open.htm | archive-date=12 February 2018 | url-status=dead }}{{cite news | url= http://www.sailing.org/events/youtholympicgames/qualification.php | title=2018 Youth Olympic Games – Qualification | work=World Sailing | date=5 June 2018 | access-date=5 June 2018}}

  • Boys' Techno 293+ – 1 boat

Shooting

{{main|Shooting at the 2018 Summer Youth Olympics}}

;Individual

class="wikitable" style="font-size:90%;"
rowspan=2|Athlete

!rowspan=2|Event

!colspan=2|Qualification

!colspan=2|Final

style="font-size:95%"

!Points

!Rank

!Points

!Rank

align=center
align=center

|align=left|Aoi Takagi

|align=left|Girls' 10m air rifle

|615.1

|15

|Colspan=2|did not advance

;Team

class="wikitable" style="font-size:90%;"
rowspan=2|Athletes

!rowspan=2|Event

!colspan=2|Qualification

!Round of 16

!Quarterfinals

!Semifinals

!colspan=2|Final / {{abbr|BM|Bronze medal match}}

style="font-size:95%"

!Points

!Rank

!Opposition
Result

!Opposition
Result

!Opposition
Result

!Opposition
Result

!Rank

align=center

|align=left|{{flagIOCathlete|Aoi Takagi|JPN|2018 Summer Youth}}
{{flagIOCathlete|Maximilian Ulbrich|GER|2018 Summer Youth}}

|align=left|Mixed 10 metre air rifle

|825.1

|7 Q

|{{flagIOCathlete|Martínez López|MEX|2018 Summer Youth}}
{{flagIOCathlete|Wadlegger|AUT|2018 Summer Youth}}
L 7–10

|colspan=4|did not advance

Sport climbing

{{main|Sport climbing at the 2018 Summer Youth Olympics}}

Japan qualified two sport climbers based on its performance at the 2017 World Youth Sport Climbing Championships. They also qualified a female climber based on its performance at the 2017 Asian Youth Sport Climbing Championships.{{cite news | url=http://www.ifsc-climbing.org/index.php/component/ifsc/?view=event&WetId=7051 | title=World Youth Championship | work=IFSC | date=10 September 2017 | access-date=13 October 2017}}{{cite news | url=http://egw.ifsc-climbing.org/Editors/2017/R17_AS_SG.pdf | title=Asian Youth Championship: Youth A Combined | work=IFSC | date=9 July 2017 | access-date=3 August 2017 | archive-date=19 February 2018 | archive-url=https://web.archive.org/web/20180219014209/http://egw.ifsc-climbing.org/Editors/2017/R17_AS_SG.pdf | url-status=dead }}

Swimming

{{main|Swimming at the 2018 Summer Youth Olympics}}

{{cite news |title=第3回ユースオリンピック競技大会|url=http://www.swim.or.jp/upfiles/1533719996-ユースオリンピック競泳2018.pdf|publisher=Japan Swimming Federation |date=8 August 2018|access-date=8 August 2018|language=ja}}

;Boys

class=wikitable style="font-size:90%"
rowspan="2"|Athlete

!rowspan="2"|Event

!colspan="2"|Heat

!colspan="2"|Semifinal

!colspan="2"|Final

style="font-size:95%"

!Time

!Rank

!Time

!Rank

!Time

!Rank

align=center

|align=left rowspan=3|Keisuke Yoshida

|align=left|200 m freestyle

|1:48.97

|1 Q

|colspan=2 {{n/a}}

|1:48.75

|5

align=center

|align=left|400 m freestyle

|3:51.68

|1 Q

|colspan=2 {{n/a}}

|3:48.68

|{{bronze03}}

align=center

|align=left|800 m freestyle

|colspan=4 {{n/a}}

|7:53.85

|{{silver02}}

align=center

|align=left rowspan=3|Taku Taniguchi

|align=left|50 m breaststroke

|28.28

|3 Q

|28.22

|4

|28.20

|4

align=center

|align=left|100 m breaststroke

|1:01.68

|3 Q

|1:02.08

|5 Q

|1:01.40

|{{bronze03}}

align=center

|align=left|200 m breaststroke

|2:16.67

|8 Q

|colspan=2 {{n/a}}

|2:15.21

|5

align=center

|align=left rowspan=3|Yu Hanaguruma

|align=left|50 m breaststroke

|29.18

|16 Q

|29.01

|14

|colspan="2" align=center|Did not advance

align=center

|align=left|100 m breaststroke

|1:02.22

|4 Q

|1:01.99

|4 Q

|1:01.62

|4

align=center

|align=left|200 m breaststroke

|2:13.58

|1 Q

|colspan=2 {{n/a}}

|2:11.63

|{{gold01}}

align=center

|align=left rowspan=3|Shinnosuke Ishikawa

|align=left|50 m butterfly

|24.64

|16 Q

|24.76

|14

|colspan="2" align=center|Did not advance

align=center

|align=left|100 m butterfly

|53.57

|7 Q

|52.67

|4 Q

|52.52

|4

align=center

|align=left|200 m butterfly

|2:01.47

|7 Q

|colspan=2 {{n/a}}

|1:59.42

|6

align=center

|align=left|Keisuke Yoshida
Taku Taniguchi
Shinnosuke Ishikawa
Yu Hanaguruma

|align=left|4 × 100 m freestyle relay

|colspan=4 {{n/a}}

|3:26.80

|6

align=center

|align=left|Keisuke Yoshida
Yu Hanaguruma
Shinnosuke Ishikawa
Taku Taniguchi

|align=left|4 × 100 m medley relay

|3:45.34

|3 Q

|colspan=2 {{n/a}}

|colspan=2 | DSQ

;Girls

class=wikitable style="font-size:90%"
rowspan="2"|Athlete

!rowspan="2"|Event

!colspan="2"|Heat

!colspan="2"|Semifinal

!colspan="2"|Final

style="font-size:95%"

!Time

!Rank

!Time

!Rank

!Time

!Rank

align=center

|align=left rowspan=3|Mayuka Yamamoto

|align=left|50 m freestyle

|25.80

|6 Q

|25.62

|7 Q

|25.39

|{{silver02}}

align=center

|align=left|100 m freestyle

|55.95

|4 Q

|56.37

|9

|colspan="2" align=center|Did not advance

align=center

|align=left|50 m butterfly

|26.84

|3 Q

|27.12

|8 Q

|27.17

|7

align=center

|align=left rowspan=3|Nagisa Ikemoto

|align=left|50 m freestyle

|26.52

|18

|colspan="4" align=center|Did not advance

align=center

|align=left|100 m freestyle

|55.51

|2 Q

|55.25

|4 Q

|55.37

|4

align=center

|align=left|200 m freestyle

|2:01.18

|6 Q

|colspan=2 {{n/a}}

|1:59.89

|5

align=center

|align=left rowspan=3|Shiori Asaba

|align=left|50 m breaststroke

|33.46

|25

|colspan="4" align=center|Did not advance

align=center

|align=left|100 m breaststroke

|1:09.27

|3 Q

|1:09.50

|6 Q

|1:09.57

|8

align=center

|align=left|200 m breaststroke

|2:29.12

|1 Q

|colspan=2 {{n/a}}

|2:26.80

|{{gold01}}

align=center

|align=left|Miku Kojima

|align=left|200 m individual medley

|2:15.37

|3 Q

|colspan=2 {{n/a}}

|2:15.09

|4

align=center

|align=left|Miku Kojima
Mayuka Yamamoto
Nagisa Ikemoto
Shiori Asaba

|align=left|4 × 100 m freestyle relay

|colspan=4 {{n/a}}

|3:49.27

|{{bronze03}}

;Mixed

class=wikitable style="font-size:90%"
rowspan=2|Athlete

!rowspan=2|Event

!colspan="2"|Heat

!colspan="2"|Final

style="font-size:95%"

!Time

!Rank

!Time

!Rank

align=center

|align=left|Keisuke Yoshida
Taku Taniguchi
Mayuka Yamamoto
Nagisa Ikemoto
Shinnosuke Ishikawa{{ref label|a|a|a}}

|align=left|4 × 100 m freestyle relay

|3:35.95

|6 Q

|3:34.18

|7

align=center

|align=left|Miku Kojima
Taku TaniguchI
Shinnosuke Ishikawa
Nagisa Ikemoto
Yu Hanaguruma{{ref label|b|b|b}}

|align=left|4 × 100 m medley relay

|3:54.14

|2 Q

|3:51.74

|{{bronze03}}

  • {{note label|a|a|a}} Swimmers who participated in the heats only.
  • {{note label|b|b|b}} Swimmers who participated in the heats only and received medals.

Table tennis

{{main|Table tennis at the 2018 Summer Youth Olympics}}

Japan qualified two table tennis players based on its performance at the Asian Continental Qualifier.{{cite news | url= https://www.ittf.com/2017/11/05/favourites-prevail-places-booked-style/ | title=Favourites prevail in Greater Noida, Buenos Aires invitations reserved in style | work=ITTF | date=5 November 2017 | access-date=10 November 2017}}

Taekwondo

{{main|Taekwondo at the 2018 Summer Youth Olympics}}

class="wikitable" style="font-size:90%"
rowspan=2|Athlete

!rowspan=2|Event

!colspan=1|Round of 16

!colspan=1|Quarterfinals

!colspan=1|Semifinals

!colspan=2|Final

style="font-size:95%"

!Opposition
Score

!Opposition
Score

!Opposition
Score

!Opposition
Score

!Rank

align=center

|align=left|Hidetaka Maeda

|align=left|Boys' 55 kg

|{{flagIOCathlete|Mason Yarrow|GBR|2018 Summer Youth}}
W (29–6)

|{{flagIOCathlete|Georgii Popov|RUS|2018 Summer Youth}}
L (13–34)

|colspan=3|did not advance

Tennis

{{main|Tennis at the 2018 Summer Youth Olympics}}

class="wikitable" style="font-size:90%"
rowspan=2|Athlete

!rowspan=2|Event

!colspan=1|First round

!colspan=1|Second round

!colspan=1|Quarterfinals

!colspan=1|Semifinals

!colspan=2|Final / {{abbr|BM|Bronze medal match}}

style="font-size:95%"

!Opposition
Score

!Opposition
Score

!Opposition
Score

!Opposition
Score

!Opposition
Score

!Rank

align=center

|align=left|Naoki Tajima

|align=left|Boys' singles

|{{flagIOCathlete|Arnaud Bovy|BEL|2018 Summer Youth}}
W (6–4, 6-2)

|{{flagIOCathlete|Hugo Gaston|FRA|2018 Summer Youth}}
L (3–6, 2-6)

|colspan=4|did not advance

align=center

|align=left|Naoki Tajima
{{flagIOCathlete|Mu Tao|CHN|2018 Summer Youth}}

|align=left|Boys' doubles

|{{flagIOCathlete|Filip Cristian Jianu
Daniel Michalski|MIX|2018 Summer Youth}}
W (6–7, 6-3)

|{{n/a}}

|{{flagIOCathlete|Sebastián Báez
Facundo Díaz Acosta|ARG|2018 Summer Youth}}
L (0–6, 1-6)

|colspan=3|did not advance

align=center

|align=left|Yuki Naito

|align=left rowspan=2|Girls' singles

|{{flagIOCathlete|Wang Xiyu|CHN|2018 Summer Youth}}
W (7–6, 7-5)

|{{flagIOCathlete|Kamilla Rakhimova|RUS|2018 Summer Youth}}
W (7–6, 3-6, 6-4)

|{{flagIOCathlete|Camila Osorio|COL|2018 Summer Youth}}
L (7–6, 3-6, 1-6)

|colspan=3|did not advance

align=center

|align=left|Naho Sato

|{{flagIOCathlete|Viktoriia Dema|UKR|2018 Summer Youth}}
L (1–6, 4-6)

|colspan=5|did not advance

align=center

|align=left|Yuki Naito
Naho Sato

|align=left|Girls' doubles

|{{flagIOCathlete|Georgia Drummy
Ana Makatsaria|MIX|2018 Summer Youth}}
W (6–1, 7-5)

|{{n/a}}

|{{flagIOCathlete|Margaryta Bilokin
Viktoriia Dema|UKR|2018 Summer Youth}}
W (7–5, 5-7)

|{{flagIOCathlete|Wang Xinyu
Wang Xiyu|CHN|2018 Summer Youth}}
W (6–4, 4-6)

|{{flagIOCathlete|Kaja Juvan
Iga Świątek|MIX|2018 Summer Youth}}
L (7–6, 5-7)

|{{silver02}}

align=center

|align=left|Yuki Naito
Naoki Tajima

|align=left|Mixed doubles

|{{flagIOCathlete|Ana Makatsaria
Patrick Sydow|MIX|2018 Summer Youth}}
W (6–0, 6-1)

|{{flagIOCathlete|Iga Świątek
Daniel Michalski|POL|2018 Summer Youth}}
W w/o

|{{flagIOCathlete|Joanna Garland
Tseng Chun-hsin|TPE|2018 Summer Youth}}
W (6–1, 6-0)

|{{flagIOCathlete|Clara Burel
Hugo Gaston|FRA|2018 Summer Youth}}
W (6–1, 7-5)

|{{flagIOCathlete|Camila Osorio
Nicolás Mejía|COL|2018 Summer Youth}}
L (6–2, 6-3)

|{{gold01}}

align=center

|align=left|Naho Sato
{{flagIOCathlete|Gilbert Soares Klier Júnior|BRA|2018 Summer Youth}}

|align=left|Mixed doubles

|{{flagIOCathlete|Georgia Drummy
Delmas N'tcha|MIX|2018 Summer Youth}}
W (6–1, 6-1)

|{{flagIOCathlete|Oksana Selekhmeteva
Carlos López Montagud|MIX|2018 Summer Youth}}
L (4-6, 7-68, [6]-[10])

|colspan=4|did not advance

Triathlon

{{main|Triathlon at the 2018 Summer Youth Olympics}}

Japan qualified two athletes based on its performance at the 2018 Asian Youth Olympic Games Qualifier.{{cite news |title=2018 Subic Bay ASTC Triathlon Asian YOG Qualifier |url=https://www.triathlon.org/results/result/2018_subic_bay_astc_triathlon_asian_yog_qualifier |access-date=25 June 2018 |work=ITU |date=17 June 2018}}

;Individual

class="wikitable" style="font-size:90%;"
Athlete

!Event

!Swim (750m)

!Trans 1

!Bike (20 km)

!Trans 2

!Run (5 km)

!Total Time

!Rank

align=center

|align=left|Teppei Tokuyama

|align=left|Boys

|9:59

|0:29

|29:10

|0:34

|17:38

|57:50

|23

align=center

|align=left|Maki Uchida

|align=left|Girls

|9:32

|0:55

|32:16

|0:32

|22:05

|1:05:20

|25

;Relay

class="wikitable" style="font-size:90%;"
Athlete

!Event

!Total Times per Athlete
(Swim 250m, Bike 6.6 km,
Run 1.8 km)

!Total Group Time

!Rank

align=center

|align=left|Asia 1
{{flagIOCathlete|Lee Jung-won|KOR|2018 Summer Youth}}
{{flagIOCathlete|Teppei Tokuyama|JPN|2018 Summer Youth}}
{{flagIOCathlete|Emma Ada Middleditch|SGP|2018 Summer Youth}}
{{flagIOCathlete|Daniil Zubtsov|KAZ|2018 Summer Youth}}

|rowspan=2 align=left|Mixed Relay

|valign=bottom|22:57 (8)
21:44 (9)
24:01 (7)
23:15 (10)

|1:31:57

|10

align=center

|align=left|Asia 2
{{flagIOCathlete|Maki Uchida|JPN|2018 Summer Youth}}
{{flagIOCathlete|Hung Tik Long|HKG|2018 Summer Youth}}
{{flagIOCathlete|Yu Xinying|CHN|2018 Summer Youth}}
{{flagIOCathlete|Chong Xian Hao|MAS|2018 Summer Youth}}

|valign=bottom|23:40 (13)
24:22 (14)
25:21 (11)
23:26 (11)

|1:36:49 1P

|13

Weightlifting

{{main|Weightlifting at the 2018 Summer Youth Olympics}}

Japan qualified one athlete based on its performance at the 2018 Asian Youth Championships.{{cite news | url= http://www.iwf.net/wp-content/uploads/downloads/2018/04/WQTEAM_Urgench2018.pdf | title=Girls Team YOG Classification from Asian Youth Championships | work=International Weightlifting Federation | date=30 April 2018 | access-date=10 May 2018}}

class=wikitable style="text-align:center; font-size:90%"
rowspan="2" |Athlete

! rowspan="2" |Event

! colspan="2" |Snatch

! colspan="2" |Clean & jerk

! rowspan="2" |Total

! rowspan="2" |Rank

style="font-size:95%"

!Result

!Rank

!Result

!Rank

Sumire Hashimoto

| Girls' -63 kg

| 75

| 7

| 95

| 8

| 170

| 8

Wrestling

{{main|Wrestling at the 2018 Summer Youth Olympics}}

;Boys

class="wikitable" style="font-size:90%"
rowspan=2|Athlete

!rowspan=2|Event

!colspan=3|Group Stage

!colspan=2|Final / {{abbr|BM|Bronze medal match}} / {{abbr|FM|5th/6th Place match}}

style="font-size:95%"

!Opposition
Score

!Opposition
Score

!Rank

!Opposition
Score

!Rank

align=center

|align=left|Hayato Fujita

|align=left|freestyle 55 kg

|{{flagIOCathlete|Vladyslav Ostapenko|UKR|2018 Summer Youth}}
L (4–10)

|{{flagIOCathlete|Robert Howard|USA|2018 Summer Youth}}
L (2–13)

|3

|{{flagIOCathlete|Gavin Whitt|GUM|2018 Summer Youth}}
W (10–0)

|5

align=center

|align=left|Wataru Sasaki

|align=left|Greco-Roman 51 kg

|{{flagIOCathlete|Mehdi Jouini|TUN|2018 Summer Youth}}
W (9–0)

|{{flagIOCathlete|Axel Salas|MEX|2018 Summer Youth}}
W (10–1)

|1

|{{flagIOCathlete|Giorgi Tokhadze|GEO|2018 Summer Youth}}
W (11–7)

|{{gold01}}

align=center

|align=left|Shu Yamada

|align=left|Greco-Roman 71 kg

|{{flagIOCathlete|Lynch Santos|GUM|2018 Summer Youth}}
W (8–0)

|{{flagIOCathlete|Stepan Starodubtsev|RUS|2018 Summer Youth}}
L (2–4)

|2

|{{flagIOCathlete|Lamjed Maafi|TUN|2018 Summer Youth}}
W (4–0)

|{{bronze03}}

;Girls

class="wikitable" style="font-size:90%"
rowspan=2|Athlete

!rowspan=2|Event

!colspan=5|Group Stage

!colspan=2|Final / {{abbr|BM|Bronze medal match}}

style="font-size:95%"

!Opposition
Score

!Opposition
Score

!Opposition
Score

!Opposition
Score

!Rank

!Opposition
Score

!Rank

align=center

|align=left|Nonoka Ozaki

|align=left|freestyle 57 kg

|{{flagIOCathlete|Andrea López|MEX|2018 Summer Youth}}
W (8–2)

|{{flagIOCathlete|Kaetlyn-Rae Quintanilla|GUM|2018 Summer Youth}}
W (10–0)

|{{flagIOCathlete|Anastasia Blayvas|GER|2018 Summer Youth}}
W (10–0)

|{{flagIOCathlete|Hala Ahmed|EGY|2018 Summer Youth}}
W (10–0)

|1

|{{flagIOCathlete|Anna Szél|HUN|2018 Summer Youth}}
W (10–0)

|{{gold01}}

align=center

|align=left|Yuka Kagami

|align=left|freestyle 73 kg

|{{flagIOCathlete|Milaimys Marín|CUB|2018 Summer Youth}}
L (1–4)

|{{flagIOCathlete|Ioana Ludgate|ASA|2018 Summer Youth}}
W (10–0)

|{{flagIOCathlete|Julia Fridlund|SWE|2018 Summer Youth}}
W (12–2)

|{{flagIOCathlete|Anika White|CAN|2018 Summer Youth}}
W (10–0)

|2

|{{flagIOCathlete|Kseniya Dzibuk|BLR|2018 Summer Youth}}
W (8–0)

|{{bronze03}}

References

{{Reflist}}

{{NOCin2018SummerYouthOlympics}}

Category:2018 in Japanese sport

Category:Nations at the 2018 Summer Youth Olympics

Category:Japan at the Youth Olympics