Jack Flaherty

Flaherty attended Harvard-Westlake School in Los Angeles, California, where his pitching coach was future MLB pitching coach Ethan Katz.{{cite web|url=https://www.mlb.com/press-release/san-francisco-giants-announce-2019-player-development-staff-and-affili-303073178 |title=San Francisco Giants announce 2019 player development staff and affiliate staffs |work=MLB.com |date=January 23, 2019 |access-date=December 13, 2019}} He pitched and played shortstop and third base as a member of the varsity baseball team for all four of his years at Harvard-Westlake. He was a sophomore when two of his high school teammates and fellow pitchers, Max Fried and Lucas Giolito, were both drafted in the first round of the 2012 MLB draft. In 2013, as a junior, Flaherty pitched a 13–0 record with a 0.63 ERA, striking out 112 batters in 89 innings while only walking 10.{{cite web|url=https://www.presstelegram.com/2013/06/12/2013-all-area-baseball-team-harvard-westlakes-jack-flaherty-leads-daily-news-picks/ |title=2013 All-Area Baseball Team: Harvard-Westlake's Jack Flaherty leads Daily News picks – Press Telegram |date=June 12, 2013 |publisher=Presstelegram.com |access-date=December 13, 2019}} During his senior season, Harvard-Westlake was the consensus #1 team in the nation in the MaxPreps "XCellent 50" for much of the beginning of the season, before dropping out of the rankings altogether.{{cite news |last=Sondheimer |first=Eric |url=https://www.latimes.com/sports/highschool/varsity-times/la-sp-vi-baseball-jack-flaherty-tops-the-hierarchy-of-harvardwestlake-pitchers-video-20140429-story.html |title=Jack Flaherty tops the hierarchy of Harvard-Westlake pitchers |newspaper=Los Angeles Times |date=April 29, 2014 |access-date=June 10, 2014}}

Flaherty played for the United States national team at the 2013 18U Baseball World Cup, pitching {{fraction|10|1|3}} innings to help win the Gold Medal in the tournament.{{cite web|url=https://www.dailynews.com/2013/09/08/chatter-harvard-westlakes-flaherty-contributes-to-us-18-under-national-baseball-team-winning-ibaf-world-cup/|title=CHATTER: Harvard-Westlake's Flaherty contributes to U.S. 18-under national baseball team winning IBAF World Cup|work=Los Angeles Daily News|date=September 8, 2013|accessdate=July 31, 2024}}

On April 29, 2014, Flaherty pitched a complete game, a 2–1 victory over Bishop Alemany High School, to bring a two-year win–loss record to 20–0.{{cite news |last=Pollon |first=Jacob |url=http://www.dailynews.com/sports/20140429/jack-flaherty-in-control-for-harvard-westlake-baseball |title=Jack Flaherty in control for Harvard-Westlake baseball |newspaper=Los Angeles Daily News |date=April 29, 2014 |access-date=June 10, 2014}} In his last two seasons, his record was 23–0 overall.{{cite news |last=Sondheimer |first=Eric |url=https://www.latimes.com/sports/highschool/varsity-times/la-sp-vi-20140605-story.html |title=Jack Flaherty is final player taken in first round of draft |newspaper=Los Angeles Times |date=June 5, 2014 |access-date=June 10, 2014}} He finished the 2014 regular season with an 0.63 ERA and a 10–0 record on his way to being named Southern Section Division I Player of the Year along with the Los Angeles Times Player of the Year.[https://www.latimes.com/sports/highschool/80452094-132.html Los Angeles Times] He pitched 78 innings (IP), struck out 125 (K) batters while giving up just 32 hits and 12 bases on balls (BB).{{cite web|url=https://www.dailynews.com/2014/06/17/harvard-westlakes-jack-flaherty-is-daily-news-all-area-baseball-player-of-the-year/ |title=Harvard-Westlake's Jack Flaherty is Daily News All-Area Baseball Player of the Year – Daily News |date=June 17, 2014 |publisher=Dailynews.com |access-date=December 13, 2019}} In the first game of the playoffs – which was also the last game of his high school career – he threw a no-hitter against Riverside North. He was subsequently named the 2014 Gatorade Player of the Year in baseball for the state of California.{{cite news |last=Sondheimer |first=Eric |url=https://www.latimes.com/sports/highschool/varsity-times/la-sp-vi-baseball-jack-flaherty-is-gatorade-state-player-of-the-year-20140527-story.html |title=Jack Flaherty is Gatorade state player of the year |newspaper=Los Angeles Times |date=May 27, 2014 |access-date=June 10, 2014}}{{cite news |last=Sondheimer |first=Eric |url=https://www.latimes.com/sports/highschool/la-sp-jack-flaherty-player-20140615-column.html |archive-url=https://web.archive.org/web/20140615055413/http://www.latimes.com/sports/highschool/la-sp-jack-flaherty-player-20140615-column.html |url-status=dead |archive-date=June 15, 2014 |title=Pitcher Jack Flaherty is The Times' baseball player of the year |newspaper=Los Angeles Times |date=June 14, 2014 |access-date=June 19, 2014}} The Los Angeles Times selected him as their baseball player of the year. In his four years on the mound, his record was 35–3.

Although Flaherty signed a letter of intent to attend the University of North Carolina,{{cite news |last=Sondheimer |first=Eric |url=https://www.latimes.com/sports/highschool/la-sp-baseball-draft-20140605-story.html |title=Harvard-Westlake's Jack Flaherty awaits MLB draft with great interest |newspaper=Los Angeles Times |date=June 4, 2014 |access-date=June 10, 2014}} he began his professional career after the St. Louis Cardinals drafted him in the first round with the 34th overall selection of the 2014 MLB draft. It was a compensatory pick that the Cardinals gained when Carlos Beltrán signed with the New York Yankees as a free agent.{{cite news |last=Trezza |first=Joe |url=https://www.stltoday.com/sports/baseball/professional/cardinal-beat/cardinals-take-two-right-handed-pitchers-in-first-round/article_191a65de-fbc3-5ede-aa62-0e755c1599bf.html |title=Cards draft four pitchers in two rounds |newspaper=St. Louis Post-Dispatch |date=June 5, 2014 |access-date=June 10, 2014}} Flaherty signed with the Cardinals on June 17 for a $2 million bonus[http://stlouis.cardinals.mlb.com/news/article/stl/cards-ink-34th-pick-flaherty-to-2-million-bonus?ymd=20140617&content_id=80263854&vkey=news_stl Cards ink 34th pick Flaherty to $2 million bonus]{{dead link|date=October 2024|bot=medic}}{{cbignore|bot=medic}} and began his minor league career with the Cardinals of the Gulf Coast League, where he posted a 1.59 ERA in {{frac|22|2|3}} innings pitched.{{cite web|url=https://www.baseball-reference.com/register/player.fcgi?id=flaher000jac|title=Jack Flaherty Minor League Statistics|work=Baseball Reference|accessdate=July 31, 2024}} In 2015 he played for the Peoria Chiefs where he was 9–3 with a 2.84 ERA in 18 starts. Prior to the 2016 season, Baseball America ranked him as the third-best prospect in the Cardinals' system.{{cite magazine |last=Manuel |first=John |url=http://www.baseballamerica.com/minors/st-louis-cardinals-top-10-prospects/ |title=St. Louis Cardinals top 10 prospects |magazine=Baseball America |date=November 16, 2015 |access-date=January 1, 2016}} He spent the season with the Palm Beach Cardinals. In their updated 2016 mid-season ranking, Baseball America rated Flaherty in the top-100 for the first time, at 88th.{{cite web |author=Staff Report |url=http://www.baseballamerica.com/minors/midseason-top-100-prospects/#CPmFPGytGK9KdiKZ.97 |title=Midseason top 100 prospects |work=Baseball America |date=July 8, 2016 |access-date=July 8, 2016}} In 24 games (23 starts) at Palm Beach, Flaherty was 5–9 with a 3.56 ERA.

Flaherty began the 2017 season with the Springfield Cardinals, and after posting a 7–2 record with a 1.42 ERA in ten starts, he was promoted to the Memphis Redbirds, where he was 7–2 with a 2.74 ERA in 15 starts. Combined, Flaherty struck out 147 and walked 35 in 148{{frac|2|3}} innings.{{cite web |url=http://m.cardinals.mlb.com/news/article/251493118/cardinals-prospect-jack-flaherty-to-make-debut/?topicId=27118406 |archive-url=https://web.archive.org/web/20170831125509/http://m.cardinals.mlb.com/news/article/251493118/cardinals-prospect-jack-flaherty-to-make-debut/?topicId=27118406 |url-status=dead |archive-date=August 31, 2017 |title=Cards prospect Flaherty to debut on Friday |work=MLB.com |date=August 30, 2017}}

File:Jack Flaherty Memphis 2018.jpg in 2018]]

On September 1, 2017, Flaherty was promoted to MLB to make his MLB debut against the San Francisco Giants.{{cite web |url=http://m.cardinals.mlb.com/news/article/251493118/cardinals-prospect-jack-flaherty-to-make-debut/?topicId=27118406 |archive-url=https://web.archive.org/web/20170831125509/http://m.cardinals.mlb.com/news/article/251493118/cardinals-prospect-jack-flaherty-to-make-debut/?topicId=27118406 |url-status=dead |archive-date=August 31, 2017 |title=Cards prospect Flaherty to debut on Friday |work=MLB.com |date=August 31, 2017}} He pitched four innings, gave up five runs, and struck out six while not receiving a decision in an eventual 11–6 win.{{cite news|url=https://www.latimes.com/socal/burbank-leader/sports/tn-blr-sp-flaherty-20170902-story.html |title=Flaherty's MLB debut with St. Louis Cardinals only goes four |newspaper=Los Angeles Times |date=September 1, 2017}} He struck out the first batter he faced, Denard Span.{{cite web|url=https://www.baseball-reference.com/boxes/SFN/SFN201709010.shtml|title=St. Louis Cardinals vs San Francisco Giants Box Score: September 1, 2017|work=Baseball Reference|accessdate=July 31, 2024}} Flaherty finished the season 0–2 with a 6.33 ERA in {{frac|21|1|3}} innings pitched.{{cite web|url=https://www.baseball-reference.com/players/f/flaheja01.shtml|title=Jack Flaherty Statistics|work=Baseball Reference|accessdate=July 31, 2024}} After the season, the Cardinals named Flaherty their 2017 Minor League Pitcher of the Year.{{cite news |url=https://www.stltoday.com/sports/baseball/professional/cardinal-beat/flaherty-bader-named-cardinals-minor-leaguers-of-the-year/article_5d67697b-1f32-5932-b50e-ad8d7e07ae96.html |title=Flaherty, Bader named Cardinals' minor leaguers of the year |newspaper=St. Louis Post-Dispatch |date=August 31, 2017}}

On March 25, 2018, the Cardinals announced that Flaherty had made the Opening Day roster in place of the injured Adam Wainwright.{{cite news|url=https://www.stltoday.com/sports/baseball/professional/cardinal-beat/ailing-wainwright-hamstring-to-go-on-dl-flaherty-called-up/article_a134728f-8675-546b-8dc1-30dd61e5e407.html|title=Ailing Wainwright (hamstring) to go on DL; Flaherty called up|newspaper=St. Louis Post-Dispatch|access-date=March 25, 2018}} He was optioned back to Memphis on April 4 once Wainwright was activated.{{cite web|url=https://highergroundtimes.com/higher-ground/2018/apr/4/cardinals-plan-to-activate-wainwright-to-start-hom/|title=Cardinals plan to activate Wainwright to start home opener|work=Higher Ground Times|date=April 4, 2018|accessdate=July 31, 2024}} He was recalled{{cite web|url=https://archcity.media/2018/04/28/cardinals-recall-jack-flaherty-option-tyler-oneill/|title=Cardinals Recall Jack Flaherty; Option Tyler O'Neill|work=Archcity Media|date=April 28, 2024|accessdate=July 31, 2024}} and optioned back{{cite web|url=https://archcity.media/2018/04/29/cards-promote-rookie-austin-gomber-option-jack-flaherty-to-memphis/|title=Cards Promote Rookie Austin Gomber; Option Jack Flaherty To Memphis|work=Archcity Media|date=April 29, 2018|accessdate=July 31, 2024}} once more before taking the injured Wainwright's spot in the rotation in May.{{cite web|url=https://www.washingtontimes.com/news/2018/may/15/cardinals-place-wainwright-back-on-dl-call-up-flah/?utm_source=RSS_Feed&utm_medium=RSS|title=Cardinals place Wainwright back on DL, call up Flaherty|work=Washington Times|date=May 15, 2018|accessdate=July 31, 2024}}

Flaherty earned his first MLB win on May 20, 2018. Throwing 120 pitches, he gave up one earned run, struck out 13, walked one, and gave up only two hits in a 5–1 win over the Philadelphia Phillies at Busch Stadium.{{cite news|url=https://www.stltoday.com/sports/baseball/professional/cardinal-beat/flaherty-dazzles-striking-out-in-innings-in---win/article_faad7904-be95-5724-a1ba-8b34a001d603.html|title=Flaherty dazzles, striking out 13 in 7 2/3 innings in 5–1 win|newspaper=St. Louis Post-Dispatch|access-date=May 20, 2018}} He finished his 2018 rookie year with an 8–9 record and a 3.34 ERA in 28 starts, striking out 182 batters in 151 innings pitched.{{cite web|url=https://www.kmov.com/sports/st-louis-cardinals-player-grades-starting-pitchers/article_6792cc3a-c694-11e8-b173-8faee838cf63.html |title=St. Louis Cardinals 2018 player grades: Starting pitchers | Sports |publisher=kmov.com |date=October 2, 2018 |access-date=December 13, 2019}}{{cite web|url=https://www.nytimes.com/athletic/377453/2018/06/01/heres-the-pitch-cards-jack-flaherty-has-one-of-filthiest-sliders-in-mlb/|title=Here's the pitch: Cards' Jack Flaherty has one of filthiest sliders in MLB|work=New York Times|first=Joe|last=Schwarz|date=June 1, 2018|accessdate=July 31, 2024}}

Flaherty entered the second half of the season with an ERA of 4.64{{cite web|url=https://www.forbes.com/sites/jaredwyllys/2019/09/21/cardinals-headed-to-nl-central-title-thanks-to-jack-flaherty/#5c77865a50c8 |title=Cardinals Headed To NL Central Title Thanks To Jack Flaherty |work=Forbes.com |access-date=December 13, 2019}} but following the All-Star break, he yielded a 0.91 ERA, the third-lowest in major league history, behind only Bob Gibson and Jake Arrieta.{{cite web|url=https://www.usatoday.com/story/sports/mlb/columnist/bob-nightengale/2019/09/29/cardinals-nl-central-mlb-playoffs/3814538002/ |title=MLB playoffs: St. Louis Cardinals clinch NL Central with rout of Cubs |publisher=Usatoday.com |date=September 29, 2019 |access-date=December 13, 2019}}{{cite web|url=https://www.afp.com/en/news/824/cardinals-crush-cubs-claim-nl-central-title-doc-1ku3ss1 |title=Multimedia |date=January 16, 2012 |publisher=AFP.com |access-date=December 13, 2019}} Flaherty was named the National League Pitcher of the Month for August after going 5–1 with a 0.71 ERA,{{cite web|url=https://www.mlb.com/news/mike-clevinger-jack-flaherty-pitchers-of-month|title=Clevinger, Flaherty earn Aug. Pitchers of Month|website=MLB.com|language=en|access-date=September 3, 2019}} and he again won the award in September with a 0.82 ERA over 44 innings.{{cite web|url=https://www.mlb.com/news/gerrit-cole-jack-flaherty-pitchers-of-the-month|title=Cole, Flaherty named Pitchers of the Month|website=MLB.com|language=en|access-date=September 30, 2019}} He ended the 2019 regular season with an 11–8 record and a 2.75 ERA over 33 starts, striking out 231 over 196{{frac|1|3}} innings,{{cite web|last=Calcaterra |first=Craig |url=https://mlb.nbcsports.com/2019/09/29/tim-anderson-christian-yelich-win-al-nl-batting-titles/ |title=Tim Anderson, Christian Yelich win AL, NL batting titles – HardballTalk |publisher=Mlb.nbcsports.com |date=September 29, 2019 |access-date=December 13, 2019}} becoming the third-youngest pitcher in baseball history to strike out at least 230 and walk 55 or fewer with a 2.75 ERA or lower.{{Cite web|url=https://www.usatoday.com/story/sports/mlb/2020/01/19/flaherty-looks-forward-to-staying-consistent-for-cardinals/41030333/|title = Flaherty looks forward to staying consistent for Cardinals|website = USA Today}} Following the season, he was nominated for his first ever Gold Glove and finished fourth in National League Cy Young Award voting.{{cite web|author=8:30 am to 11:00 am |url=https://kmox.radio.com/articles/news/st-louis-cardinals-have-six-gold-glove-finalists |title=St. Louis Cardinals have six Gold Glove finalists | KMOX-AM |publisher=Kmox.radio.com |date=October 24, 2019 |access-date=December 13, 2019}}{{cite web|url=https://bbwaa.com/19-nl-cy/|title=Mets' Jacob deGrom cruises to landslide victory to take 2nd straight Cy Young Award – BBWAA|date=November 13, 2019 |language=en-US|access-date=November 14, 2019}} He was also named All-MLB second team that year.{{cite web|url=https://www.foxsports.com/midwest/story/st-louis-cardinals-jack-flaherty-named-to-inaugural-all-mlb-second-team-121019|title=Cardinals' Flaherty named to inaugural All-MLB second team|website=Fox Sports|date=December 10, 2019|accessdate=February 19, 2022}} He made his post-season debut this season, making two starts in the Division Series against the Atlanta Braves and allowing four runs in 13 innings while striking out 16. He also made one start in the Championship Series against the Washington Nationals, giving up four runs in four innings.{{cite web|url=https://www.baseball-reference.com/postseason/2019_NLCS.shtml|title=2019 NLCS Washington Nationals over St. Louis Cardinals (4-0)|work=Baseball Reference|accessdate=July 31, 2024}}

Flaherty made his first Opening Day start to open the pandemic shortened 2020 season.{{Cite web|url=https://www.espn.com/mlb/story/_/id/29467137/pitcher-jack-flaherty-gets-opening-day-start-st-louis-cardinals-vs-pittsburgh-pirates|title = Cards ace Flaherty to start season vs. Pirates|date = July 15, 2020}} He started nine games in which he went 4–3 with a 4.91 ERA and 49 strikeouts over 40{{frac|1|3}} innings.{{Cite web|url=https://www.stltoday.com/sports/baseball/professional/birdland/goold-as-cardinals-face-flaherty-in-arbitration-hearing-the-real-cost-of-mlbs-system-isnt/article_8a122247-13ac-5226-9105-9d540e2668bd.html|title = Goold: As Cardinals face Flaherty in arbitration hearing, the real cost of MLB's system isn't only in dollars| date=February 6, 2021 }} He also made one start in the Wild Card Series, allowing only one run in six innings but taking the loss when the Cardinals were shut out by the San Diego Padres.{{cite web|url=https://www.baseball-reference.com/postseason/2020_NLWC2.shtml|title=2020 Wild Card Series San Diego Padres over St. Louis Cardinals (2-1)|work=Baseball Reference|accessdate=July 31, 2024}}

Prior to the 2021 season, Flaherty won his salary arbitration case against the Cardinals, and he made $3.9 million as opposed to the Cardinals submitted salary of $3 million.{{Cite web|url=https://www.ksdk.com/article/sports/mlb/stl-cardinals/jack-flaherty-is-not-going-to-stop-being-himself-after-arbitration-win/63-cd8c6301-4d55-4039-90fb-fc76a716c894|title = Commentary | Jack Flaherty is not going to be quiet, and he shouldn't|date = February 16, 2021}} He made his second consecutive Opening Day start{{Cite web|url=https://www.mlb.com/news/jack-flaherty-named-cardinals-2021-opening-day-starter|title = Flaherty named Cards' Opening Day starter|website = MLB.com}} and on May 8, hit his first career home run off of Colorado Rockies starter Austin Gomber.{{Cite web|url=https://www.mlb.com/news/jack-flaherty-hits-first-mlb-home-run|title = Flaherty steals show with 1st HR, 7 scoreless|website = MLB.com}} On May 31, he was placed on the injured list for the first time in his career after suffering an oblique strain while batting.{{Cite web|url=https://www.mlb.com/news/jack-flaherty-injured-list-oblique-strain|title=Cards put ace Flaherty (Oblique strain) on IL|website=MLB.com}} He returned to the club on August 13, but was placed on the injured list once again on August 25 with a right shoulder strain.{{Cite web|url=https://www.mlb.com/news/jack-flaherty-strikes-out-five-in-return-to-cardinals|title='A perfect outing': Flaherty dominant in return|website=MLB.com}}{{Cite news|url=https://theathletic.com/news/cardinals-place-jack-flaherty-on-10-day-injured-list-with-shoulder-strain/S1OWjbaU19pk|title = Cardinals place Jack Flaherty on 10-day injured list with shoulder strain}} He was activated September 24.{{Cite web|url=https://www.cbssports.com/fantasy/baseball/news/cardinals-jack-flaherty-activated-prior-to-start/|title = Cardinals' Jack Flaherty: Activated prior to start| date=September 24, 2021 }}

For the 2021 season, Flaherty appeared in 17 games (making 15 starts), going 9–2 with a 3.22 ERA, 85 strikeouts, and 26 walks over {{frac|78|1|3}} innings.{{Cite web|url=https://www.stltoday.com/sports/baseball/professional/cardinals-2021-report-card-pitchers-were-solid-at-the-top/collection_65f08cb4-fca1-5a1c-9d33-f7156974964d.html|title = Cardinals 2021 report card: Pitchers were solid at the top| date=October 14, 2021 }}

On March 22, Flaherty signed a one-year, $5 million, contract with the Cardinals to avoid salary arbitration.{{Cite web|url=https://www.kmov.com/2022/03/22/report-cardinals-flaherty-avoid-arbitration-settle-salary-2022-season-2/|title = Report: Cardinals, Flaherty avoid arbitration, settle on salary for 2022 season| date=March 22, 2022 }} He entered the season dealing with a right shoulder injury that sidelined him during spring training and the beginning of the season.{{cite web | last=Trezza | first=Joe | title=Jack Flaherty clarifies shoulder injury | website=MLB.com | date=March 20, 2022 | url=https://www.mlb.com/news/jack-flaherty-clarifies-shoulder-injury | access-date=December 31, 2024}} After making three starts in June and struggling to a 5.63 ERA, he departed his third start with shoulder tightness and was later placed on the 60-day injured list on July 11.{{cite web | last=de Artola | first=Alicia | title=Cardinals get worst-case injury scenario for Jack Flaherty | website=FanSided | date=July 11, 2022 | url=https://fansided.com/2022/07/11/cardinals-injury-update-jack-flaherty/ | access-date=December 31, 2024}} He was activated again on September 5{{cite web | last=Sharkey-Gotlieb | first=Simon | title=Cardinals activate Flaherty from IL | website=theScore.com | date=September 5, 2022 | url=https://www.thescore.com/mlb/news/2414017/amp | access-date=December 31, 2024}} and finished the season with a 4.25 ERA in nine appearances.

File:Flaherty_Cardinals_2023.png

On January 13, 2023, Flaherty agreed to a one-year, $5.4 million contract, again avoiding salary arbitration.{{Cite web |last=Dierkes |first=Tim |date=January 14, 2023 |title=2023 MLB Arbitration Tracker |url=https://www.mlbtraderumors.com/2023/01/2023-mlb-arbitration-tracker.html |access-date=December 31, 2024 |website=MLB Trade Rumors}} He made 20 starts for the Cardinals, with a 4.43 ERA and 106 strikeouts.

On August 1, 2023, Flaherty was traded to the Baltimore Orioles in exchange for prospects César Prieto, Drew Rom, and Zack Showalter.{{cite web|url=https://www.cbssports.com/mlb/news/jack-flaherty-trade-orioles-acquire-starting-pitcher-in-deadline-deal-with-cardinals/|first=Mile|last=Axisa|title=Jack Flaherty trade: Orioles acquire starting pitcher in deadline deal with Cardinals|website=CBSSports.com|date=August 2023 }}{{cite news |title=Orioles acquire right-hander Jack Flaherty from Cardinals |url=https://www.espn.com/mlb/story/_/id/38116728/orioles-acquire-right-hander-jack-flaherty-cardinals |access-date=August 2, 2023 |agency=Associated Press |work=ESPN.com |date=August 1, 2023}} Two days later, he allowed a run in six innings to earn the win in his Orioles debut against the Toronto Blue Jays.{{cite web | last=Rill | first=Jake | title=Jack Flaherty dominates in Orioles debut, beats Blue Jays | website=MLB.com | date=August 4, 2023 | url=https://www.mlb.com/news/jack-flaherty-dominates-in-orioles-debut-beats-blue-jays | access-date=December 31, 2024}} He was 1–3 with a 6.75 ERA in nine appearances (seven starts) for the Orioles in the regular season and allowed one run on two hits in two innings of relief in the Division Series against the Texas Rangers.{{cite web|url=https://www.baseball-reference.com/postseason/2023_ALDS1.shtml|title=2023 AL Division Series Texas Rangers over Baltimore Orioles (3-0)|work=Baseball Reference|accessdate=July 31, 2024}}

On December 20, 2023, Flaherty signed a one-year, $14 million contract with the Detroit Tigers.{{cite news |title=Jack Flaherty, Tigers finalize $14 million, 1-year contract |url=https://www.espn.com/mlb/story/_/id/39157744/jack-flaherty-tigers-finalize-14-million-1-year-contract |access-date=December 21, 2023 |agency=Associated Press |work=ESPN.com |date=December 20, 2023}} In 18 starts for Detroit in 2024, he went 7–5 with a 2.95 ERA and 133 strikeouts.

On July 30, 2024, the Tigers traded Flaherty to the Los Angeles Dodgers in exchange for minor league prospects Thayron Liranzo and Trey Sweeney.{{cite web|url=https://www.mlb.com/dodgers/news/jack-flaherty-trade-dodgers-tigers|title=Dodgers get Flaherty from Tigers, Kiermaier from Jays|work=mlb.com|first=Juan|last=Toribio|date=July 30, 2024|accessdate=July 30, 2024}} He made 10 starts for the Dodgers, with a 6–2 record, 3.58 ERA and 61 strikeouts.

Flaherty pitched Game 2 of the 2024 NLDS against the San Diego Padres and took the loss, while allowing four runs in {{fraction|5|1|3}} innings. He allowed a solo homer to Fernando Tatís Jr. in the first and a two-run homer to David Peralta in the fourth inning.{{cite web|url=https://www.mlb.com/dodgers/news/dodgers-lose-nl-division-series-game-2-2024|title=Dodgers' pitching concerns creep in as NLDS evens up|work=mlb.com|first=Juan|last=Toribio|date=October 6, 2024|accessdate=October 29, 2024}} In his second postseason start, in the opening game of the 2024 NLCS against the New York Mets, he pitched seven scoreless innings in the Dodgers shutout win.{{cite web|url=https://www.mlb.com/news/jack-flaherty-throws-seven-scoreless-innings-in-nlcs-game-1|title=On hometown mound, Flaherty puts on 'pitching clinic' in Game 1|work=mlb.com|first=Adam|last=McCalvy|date=October 13, 2024|accessdate=October 29, 2024}} However, in his Game 5 start, Flaherty had one of the worst starts of his career, allowing a leadoff single and a walk to open the game which led to a three-run home run by Pete Alonso. In three innings, he allowed eight runs on eight hits and four walks.{{cite web|url=https://www.mlb.com/news/dodgers-lose-nlcs-game-5-2024|title=Flaherty's ineffective start leaves Dodgers eyeing path to clinch in LA|work=mlb.com|first=Juan|last=Toribio|date=October 18, 2024|accessdate=October 18, 2024}} Despite the poor start, he was chosen to start the opening game of the 2024 World Series against the New York Yankees.{{cite web|url=https://www.mlb.com/news/jack-flaherty-world-series-game-1-starter-for-dodgers|title=Hometown kid Flaherty to start World Series Game 1 in LA|work=MLB.com|first=Juan|last=Toribio|date=October 22, 2024|accessdate=October 29, 2024}} He shut out the Yankees for five innings, before allowing a two-run home run to Giancarlo Stanton in the sixth inning. Overall, he allowed just the two runs on five hits with six strikeouts in {{fraction|5|1|3}} innings.{{cite web|url=https://www.usatoday.com/story/sports/mlb/2024/10/26/jack-flaherty-dodgers-world-series-game-1-victory/75861527007/|title=After roller-coaster NLCS, Jack Flaherty delivers for Dodgers in World Series Game 1|work=USA Today|first=James H.|last=Williams|date=October 26, 2024|accessdate=October 29, 2024}} He performed poorly in his second start of the World Series, in Game 5, allowing four runs on two home runs in only {{fraction|1|1|3}} innings pitched. Despite his performance, the Dodgers came back to win the game and the series.{{cite web|url=https://www.mlb.com/dodgers/news/dodgers-beat-yankees-win-2024-world-series|title=Dodgers 'hit every speed bump possible' on way to title|work=mlb.com|first=Juan|last=Toribio|date=October 31, 2024|accessdate=October 31, 2024}}

On February 7, 2025, Flaherty signed a two-year, $35 million contract to return to the Detroit Tigers.{{Cite web|title=Jack Flaherty and Detroit Tigers finalize $35 million, 2-year contract|url=https://ca.sports.yahoo.com/news/jack-flaherty-detroit-tigers-finalize-164955411.html|access-date=February 7, 2025|website=ca.sports.yahoo.com|date=February 7, 2025 |language=en}} On May 22, Flaherty recorded his 1,000th career strikeout when he struck out José Ramírez in the top of the first inning against the Cleveland Guardians.{{Cite web|title=Tigers blanked by Guardians in soggy series opener at Comerica Park|url=https://www.mlive.com/tigers/2025/05/tigers-blanked-by-guardians-in-soggy-series-opener-at-comerica-park.html|access-date=May 22, 2025|website=mlive.com|date=May 22, 2025 |language=en}}

Flaherty was adopted by Eileen Flaherty when he was three weeks old.{{cite web | last=Goold | first=Derrick | title=Goold: Relentless 'five-tool' single moms shaped the lives of several Cardinals pitchers | website=STLtoday.com | date=December 20, 2024 | url=https://www.stltoday.com/sports/professional/mlb/cardinals/goold-relentless-five-tool-single-moms-shaped-the-lives-of/article_d23e11c5-2603-5244-a655-c50c4be1e3cc.html | access-date=December 31, 2024}} Flaherty is Catholic.{{Cite web |last=Doering |first=Joshua |date=September 30, 2019 |title=St. Louis Cardinals pitcher Jack Flaherty stays grounded in Christ during historic season |url=https://sportsspectrum.com/sport/baseball/2019/09/30/st-louis-cardinals-pitcher-jack-flaherty-stays-grounded-in-christ-during-historic-season/ |access-date=2025-06-01 |website=Sports Spectrum}}{{Cite web |last=Claybourn |first=Cole |date=July 8, 2020 |title=Cardinals pitcher Jack Flaherty talks faith and grief on 'Table Forty' podcast |url=https://sportsspectrum.com/sport/baseball/2020/07/08/cardinals-jack-flaherty-talks-faith-grief-table-forty/ |access-date=July 25, 2024 |website=Sports Spectrum |language=en-US}} He is biracial and identifies as Black{{Cite web |last=Justice |first=Richard |author-link=Richard Justice (sports journalist) |date=August 25, 2020 |title=Jack Flaherty on Jacob Blake shooting |url=https://www.mlb.com/news/jack-flaherty-on-jacob-blake-shooting |access-date=September 28, 2024 |website=MLB.com}} and has been actively involved in supporting the Black Lives Matter movement and other social justice movements.{{cite web | last=Rogers | first=Anne | title=Jack Flaherty on Black Lives Matter, racial injustice | website=MLB.com | date=July 9, 2020 | url=https://www.mlb.com/news/jack-flaherty-on-black-lives-matter-racial-injustice | access-date=September 28, 2024}}

• List of World Series starting pitchers

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• {{Twitter|Jack9Flaherty|Jack Flaherty}}

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