Jenson Tyler " J. T." Brooksby  (born October 26, 2000) is an American professional  tennis player. He reached a career-high ranking of World No. 81 in singles on 13 September 2021.
Brooksby enrolled at
Baylor University to play college tennis, but turned pro after he redshirted his freshman season due to injury.
2018: Grand Slam debut
On August 12, 2018, Brooksby defeated
Brandon Nakashima to win the USTA Boys' under-18 national championship. This victory earned him a wild card into the main draw of the  US Open. He lost in the first round to eventual quarterfinalist  John Millman.
2019: US Open second round
On August 23, 2019, Brooksby qualified for the main draw of the
US Open, where he defeated Tomáš Berdych in four sets in the first round. However, in the second round, Brooksby went down in a four-set match to 17th seed  Nikoloz Basilashvili of Georgia.
2021: First ATP final, US Open fourth round, Top 100 debut
In 2021, Brooksby won three Challenger trophies, at
Potchefstroom-2, Orlando-1, and Tallahassee. He made his debut in the top 150 by reaching a then career high of world No. 149 on 14 June 2021.
He also reached his first ATP tour final at the
2021 Hall of Fame Open in Newport, defeating Evgeny Donskoy,  Denis Kudla,  Peter Gojowczyk, and 7th seed  Jordan Thompson. He became the second-youngest player to reach the final in the 45-year tournament history on Newport's grass courts.  He lost to 8th seed  Kevin Anderson in the final. This result brought Brooksby up to a new career high of No. 126 on 19 July 2021.
2021 Citi Open, Brooksby upset 2nd seed and 15th ranked Félix Auger-Aliassime to earn his first top 50 (and top 20) win and advance into his first ATP 500 level quarterfinal. He beat  John Millman to advance to his first ATP 500 semifinal, where he lost to 5th seed (and eventual champion)  Jannik Sinner. As a result of this run, Brooksby entered the top 100 for the first time, becoming world No. 99 on 9 August 2021. 
The following week at the
2021 National Bank Open, Brooksby made his debut at ATP 1000 level but lost in the first round to Nikoloz Basilashvili.
Brooksby then received a singles wild card into the
US Open. He reached the fourth round of a Major for the first time, defeating Mikael Ymer, compatriot  Taylor Fritz, and 21st seed  Aslan Karatsev. Brooksby, aged 20, became the youngest American to reach the US Open fourth round since a then 20-year-old  Andy Roddick did so in 2002. Brooksby defeated Karatsev in the 31st five-setter of the tournament – tied with 2015 Wimbledon for most at a Grand Slam event since 34 at the 2004 US Open. He then lost to world No. 1 Novak Djokovic in four sets.
(W) Won; (F) finalist; (SF) semifinalist; (QF) quarterfinalist; (#R) rounds 4, 3, 2, 1; (RR) round-robin stage; (Q#) qualification round; (P#) preliminary round; (DNQ) did not qualify; (A) absent; (Z#) Davis/Fed Cup Zonal Group (with number indication) or (PO) play-off; (G) gold, (F-S) silver or (SF-B) bronze Olympic/Paralympic medal; a (NMS) downgraded Masters Series/1000 tournament; (P) postponed; (NH) not held. SR=strike rate (events won/competed)
To avoid confusion and double counting, these charts are updated at the conclusion of a tournament or when the player's participation has ended.
This table is current through the
2021 US Open.
ATP career finals
Singles: 1 (1 runner-up)
Grand Slam tournaments (0–0)
ATP World Tour Finals (0–0)
ATP World Tour Masters 1000 (0–0)
ATP World Tour 500 Series (0–0)
ATP World Tour 250 Series (0–1)
Titles by surface
Titles by setting
ATP Challenger and ITF Futures finals
Singles: 7 (6–1)
ATP Challenger Tour (3–1)
ITF Futures Tour (3–0)
Titles by Surface
Santiago Rodríguez Taverna
Potchefstroom, South Africa
2–6, 6–3, 6–0
6–3, 4–6, 6–3
Record against other players
Record against top 10 players
Brooksby's match record against those who have been
ranked in the top 10. Players who have been No. 1 are in boldface.
* As of 6 September 2021.
"A College Coach's Dream: Jenson Brooksby". crackedracquets.com. Cracked Racquets. February 16, 2018 . Retrieved . August 12, 2018
"Men's Tennis Signs Brooksby to National Letter of Intent". baylorbears.com. December 12, 2018 . Retrieved . February 21, 2019
"USTA Boys | 2018 Boys 18 Singles Main Draw".
Kapetanakis, Arthur (August 13, 2018). "OSUIGWE, BROOKSBY WIN USTA JUNIOR NATIONAL TITLES". USTA . Retrieved . August 14, 2018
Harris, Noel (August 28, 2018). "It was a hot day at the U.S. Open. Here's how Carmichael teen Jenson Brooksby fared". The Sacramento Bee . Retrieved . July 16, 2021
Sode, Scott (August 26, 2019). "Jenson Brooksby defeats Tomas Berdych in Round 1 of the 2019 US Open". usopen.org . Retrieved . August 5, 2021
Zagoria, Adam (August 29, 2019). "Baylor Tennis Pledge Jenson Brooksby Loses At U.S. Open; Now A Decision Looms". Forbes . Retrieved . August 5, 2021
"Challenger Q&A: Brooksby Continues Historic Run With Tallahassee Crown".
"ATP roundup: American Jenson Brooksby wins at Newport, R.I., grass tourney".
"JENSON BROOKSBY ON THE RISE WITH ATP RUN IN NEWPORT".
"#NextGenATP Brooksby Powers Into First ATP SF In Newport".
"20-year-old American Brooksby makes final in Newport".
"20-year-old American Brooksby makes final in Newport".
"Anderson Returns To The Winners' Circle In Newport".
"Red-Hot Brooksby Bounces Felix In Washington".
"Semifinalist Jenson Brooksby has surprised just about everyone at the Citi Open but himself".
"Sinner Halts Brooksby In #NextGenATP Clash To Reach Washington Final".
"Red-Hot #NextGenATP Star Brooksby Makes Top 100 Breakthrough".
"Nishikori Battles Through In Toronto, Brooksby Falls".
"Fritz, Brooksby Lead US Charge Into Second Round". ATP Tour.
"#NextGenATP American Brooksby Downs Fritz In New York". ATP Tour.
"Like Rocky Vs. Drago, Brooksby Knocks Out Karatsev". ATP Tour.
"Djokovic Digs Deep To Fend Off Brooksby At US Open". ATP Tour.