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Jenson Tyler "J. T." Brooksby (born October 26, 2000) is an American professional tennis player. He has a career-high ATP singles ranking of world No. 33, achieved on June 13, 2022. Brooksby has won one ATP Tour singles title at the 2025 U.S. Men's Clay Court Championships.
| W | F | SF | QF | | RR | Q# | P# | DNQ | A | Z# | PO | G | S | B | NMS | NTI | P | NH |
| Tournament | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2025 | SR | W–L | Win % | |
| Grand Slam tournaments | |||||||||||
| Australian Open | A | A | A | A | A | 3R | 1R | 0 / 2 | 2–2 | 50% | |
| French Open | A | A | A | 1R | 1R | A | 2R | 0 / 3 | 1–3 | 25% | |
| Wimbledon | A | A | NH | A | 3R | A | 2R | 0 / 2 | 3–2 | 60% | |
| US Open | 1R | 2R | A | 4R | 3R | A | 2R | 0 / 5 | 7–5 | 58% | |
| Win–loss | 0–1 | 1–1 | 0–0 | 3–2 | 4–3 | 2–1 | 3–4 | 0 / 12 | 13–12 | 52% | |
| ATP 1000 tournaments | |||||||||||
| Indian Wells Open | A | A | NH | 2R | 4R | A | 3R | 0 / 3 | 6–3 | 67% | |
| Miami Open | A | A | NH | Q2 | 4R | A | 1R | 0 / 2 | 3–2 | 60% | |
| Monte-Carlo Masters | A | A | NH | A | A | A | A | 0 / 0 | 0–0 | – | |
| Madrid Open | A | A | NH | A | 1R | A | A | 0 / 1 | 0–1 | 0% | |
| Italian Open | A | A | A | A | 3R | A | A | 0 / 1 | 2–1 | 67% | |
| Canadian Open | A | A | NH | 1R | 2R | A | 1R | 0 / 3 | 1–3 | 25% | |
| Cincinnati Open | A | A | A | A | 1R | A | 3R | 0 / 2 | 2–2 | 50% | |
| Shanghai Masters | A | A | NH | A | 2R | 0 / 1 | 1–1 | 50% | |||
| Paris Masters | A | A | A | 1R | A | A | Q1 | 0 / 0 | 0–0 | – | |
| Win–loss | 0–0 | 0–0 | 0–0 | 1–2 | 9–6 | 0–0 | 5–5 | 0 / 13 | 15–13 | 54% | |
| Career statistics | |||||||||||
| Tournaments | 1 | 1 | 0 | 7 | 22 | 2 | 16 | Career total: 49 | |||
| Titles | 0 | 0 | 0 | 0 | 0 | 0 | 1 | Career total: 1 | |||
| Finals | 0 | 0 | 0 | 1 | 2 | 0 | 2 | Career total: 5 | |||
| Overall win–loss | 0–1 | 1–1 | 0–0 | 15–7 | 24–22 | 5–2 | 21–15 | 1 / 49 | 66–48 | 58% | |
| Year-end ranking | 978 | 269 | 307 | 56 | 48 | 297 | $3,132,016 | ||||
| Legend |
| Grand Slam (0–0) |
| ATP 1000 (0–0) |
| ATP 500 (0–0) |
| ATP 250 (1–4) |
| Finals by surface |
| Hard (0–2) |
| Clay (1–0) |
| Grass (0–2) |
| Finals by setting |
| Outdoor (1–3) |
| Indoor (0–1) |
| Result | W–L | Date | Tournament | Tier | Surface | Opponent | Score |
| Loss | 0–1 | Jul 2021 | Hall of Fame Open, United States | ATP 250 | Grass | Kevin Anderson | 6–7(8–10), 4–6 |
| Loss | 0–2 | Feb 2022 | Dallas Open, United States | ATP 250 | Hard (i) | Reilly Opelka | 6–7(5–7), 6–7(3–7) |
| Loss | 0–3 | Jul 2022 | Atlanta Open, United States | ATP 250 | Hard | Alex de Minaur | 3–6, 3–6 |
| Win | 1–3 | Mar 2025 | Men's Clay Court Championships, United States | ATP 250 | Clay | Frances Tiafoe | 6–4, 6–2 |
| Loss | 1–4 | Jun 2025 | Eastbourne Open, United Kingdom | ATP 250 | Grass | Taylor Fritz | 5–7, 1–6 |
| Legend |
| ATP Challenger Tour (3–1) |
| ITF WTT (3–0) |
| Finals by surface |
| Hard (5–1) |
| Clay (1–0) |
| Result | W–L | Date | Tournament | Tier | Surface | Opponent | Score |
| Win | 1–0 | Feb 2021 | Potchefstroom Open, South Africa | Challenger | Hard | Teymuraz Gabashvili | 2–6, 6–3, 6–0 |
| Loss | 1–1 | Mar 2021 | Cleveland Open, US | Challenger | Hard (i) | Bjorn Fratangelo | 5–7, 4–6 |
| Win | 2–1 | Apr 2021 | Orlando Open, US | Challenger | Hard | Denis Kudla | 6–3, 6–3 |
| Win | 3–1 | Apr 2021 | Tallahassee Tennis Challenger, US | Challenger | Clay | Bjorn Fratangelo | 6–3, 4–6, 6–3 |
| Result | W–L | Date | Tournament | Tier | Surface | Opponent | Score |
| Win | 1–0 | Mar 2019 | M25 Bakersfield, US | WTT | Hard | Aleksandar Vukic | 6–3, 6–1 |
| Win | 2–0 | Jul 2019 | M25 Champaign, US | WTT | Hard | Oliver Crawford | 6–2, 6–1 |
| Win | 3–0 | Jul 2019 | M25 Decatur, US | WTT | Hard | Santiago Rodríguez Taverna | 6–1, 6–4 |
| Season | 2022 | 2023 | Total |
| Wins | 1 | 1 | 2 |
| # | Player | Rk | Event | Surface | Rd | Score | Rk | Ref |
| 2022 | ||||||||
| 1. | Stefanos Tsitsipas | 5 | Indian Wells Open, United States | Hard | 3R | 1–6, 6–3, 6–2 | 43 | |
| 2023 | ||||||||
| 2. | Casper Ruud | 3 | Australian Open, Australia | Hard | 2R | 6–3, 7–5, 6–7(4–7), 6–2 | 39 | |
| Awards | ||
| Preceded by Carlos Alcaraz | ATP Newcomer of the Year 2021 | Succeeded by Holger Rune |