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Gabriel Diallo (born September 24, 2001) is a Canadian professional tennis player. He has a career-high ATP singles ranking of world No. 33, achieved on 18 August 2025 and a doubles ranking of No. 321, achieved on 8 January 2024. He is currently the No. 3 singles player from Canada. Diallo won one ATP title at the 2025 Libéma Open. Diallo played college tennis at the University of Kentucky.
| W | F | SF | QF | | RR | Q# | P# | DNQ | A | Z# | PO | G | S | B | NMS | NTI | P | NH |
| Tournament | 2022 | 2023 | 2024 | 2025 | SR | W–L | Win% | |
| Grand Slam tournaments | ||||||||
| Australian Open | A | Q1 | Q3 | 2R | 0 / 1 | 1–1 | 50% | |
| French Open | A | Q1 | 1R | 2R | 0 / 2 | 1–2 | 33% | |
| Wimbledon | A | Q2 | Q2 | 2R | 0 / 1 | 1–1 | 50% | |
| US Open | A | Q1 | 3R | 2R | 0 / 2 | 3–2 | 60% | |
| Win–loss | 0–0 | 0–0 | 2–2 | 4–4 | 0 / 6 | 6–6 | 50% | |
| National representation | ||||||||
| Davis Cup | W | QF | QF | G1 | 1 / 3 | 6–5 | 55% | |
| ATP 1000 tournaments | ||||||||
| Indian Wells Open | A | A | A | 2R | 0 / 1 | 1–1 | 50% | |
| Miami Open | A | A | Q1 | 2R | 0 / 1 | 1–1 | 50% | |
| Monte-Carlo Masters | A | A | A | Q1 | 0 / 0 | 0–0 | – | |
| Madrid Open | A | A | A | QF | 0 / 1 | 4–1 | 80% | |
| Italian Open | A | A | A | 1R | 0 / 1 | 0–1 | 0% | |
| Canadian Open | Q2 | 2R | 1R | 3R | 0 / 3 | 2–3 | 40% | |
| Cincinnati Open | A | A | A | 3R | 0 / 1 | 1–1 | 50% | |
| Shanghai Masters | NH | A | 1R | 4R | 0 / 2 | 2–2 | 50% | |
| Paris Masters | A | A | A | 0 / 0 | 0–0 | – | ||
| Win–loss | 0–0 | 1–1 | 0–2 | 10–7 | 0 / 10 | 11–10 | 52% | |
| Career statistics | ||||||||
| 2022 | 2023 | 2024 | 2025 | SR | W–L | Win % | ||
| Tournaments | 0 | 4 | 7 | 23 | Career total: 34 | |||
| Titles | 0 | 0 | 0 | 1 | Career total: 1 | |||
| Finals | 0 | 0 | 1 | 1 | Career total: 2 | |||
| Hard win–loss | 0–1 | 3–5 | 8–6 | 13–16 | 0 / 23 | 24–28 | 46% | |
| Clay win–loss | 0–0 | 0–0 | 0–1 | 6–4 | 0 / 5 | 6–5 | 55% | |
| Grass win–loss | 0–0 | 0–1 | 0–1 | 9–3 | 1 / 6 | 9–5 | 64% | |
| Overall win–loss | 0–1 | 3–6 | 8–8 | 28–23 | 1 / 34 | 39–38 | 51% | |
| Win % | 0% | 33% | 50% | 55% | 50.65% | |||
| Year-end ranking | 227 | 139 | 87 | mw- $2,307,031 | ||||
| Legend |
| Grand Slam (0–0) |
| ATP 1000 (0–0) |
| ATP 500 (0–0) |
| ATP 250 (1–1) |
| Finals by surface |
| Hard (0–1) |
| Clay (0–0) |
| Grass (1–0) |
| Finals by setting |
| Outdoor (1–0) |
| Indoor (0–1) |
| Result | W–L | Date | Tournament | Tier | Surface | Opponent | Score |
| Loss | 0–1 | Oct 2024 | Almaty Open, Kazakhstan | ATP 250 | Hard (i) | Karen Khachanov | 2–6, 7–5, 3–6 |
| Win | 1–1 | Jun 2025 | Libéma Open, Netherlands | ATP 250 | Grass | Zizou Bergs | 7–5, 7–6(10–8) |
| Legend |
| ATP Challenger Tour (3–1) |
| Finals by surface |
| Hard (3–1) |
| Clay (0–0) |
| Result | W–L | Date | Tournament | Tier | Surface | Opponent | Score |
| Win | 1–0 | Aug 2022 | Championnats de Granby, Canada | Challenger | Hard | Shang Juncheng | 7–5, 7–6(7–5) |
| Loss | 1–1 | Oct 2022 | Fairfield Challenger, US | Challenger | Hard | Michael Mmoh | 3–6, 2–6 |
| Win | 2–1 | Oct 2023 | Slovak Open, Slovakia | Challenger | Hard (i) | Joris De Loore | 6–0, 7–5 |
| Win | 3–1 | Jul 2024 | Chicago Men's Challenger, US | Challenger | Hard | Bu Yunchaokete | 6–3, 7–6(7–3) |
| Legend |
| ATP Challenger Tour (1–0) |
| Result | W–L | Date | Tournament | Tier | Surface | Partner | Opponents | Score |
| Win | 1–0 | Aug 2023 | Winnipeg Challenger, Canada | Challenger | Hard | Leandro Riedi | Taha Baadi Juan Carlos Aguilar | 6–2, 6–3 |
| Legend |
| ITF WTT (2–2) |
| Finals by surface |
| Hard (2–2) |
| Clay (0–0) |
| Result | W–L | Date | Tournament | Tier | Surface | Opponent | Score |
| Loss | 0–1 | Jun 2021 | M15 Champaign, US | WTT | Hard | Jason Kubler | 2–6, 1–6 |
| Loss | 0–2 | Nov 2021 | M15 East Lansing, US | WTT | Hard | Raymond Sarmiento | 6–4, 3–6, 4–6 |
| Win | 1–2 | Jun 2022 | M25 East Lansing, US | WTT | Hard | Andres Martin | 6–3, 7–6(7–4) |
| Win | 2–2 | Mar 2023 | M25 Montreal, Canada | WTT | Hard (i) | Henri Squire | 7–6(7–5), 6–3 |
| Legend |
| ITF WTT (0–1) |
| Result | W–L | Date | Tournament | Tier | Surface | Partner | Opponents | Score |
| Loss | 0–1 | Nov 2019 | M15 East Lansing, US | WTT | Hard | Millen Hurrion | Jacob Dunbar David Fox | 4–6, 6–7(3–7) |
| Finals by tournament |
| Davis Cup (1–0) |
| Laver Cup (0–0) |
| ATP Cup (0–0) |
| Finals by team |
| Canada (1–0) |
| World (0–0) |
| Result | Date | Tournament | Surface | Team | Partners | Opponent team | Opponents | Score |
| Win | Nov 2022 | Davis Cup, Málaga | Hard (i) | Canada | Félix Auger-AliassimeDenis ShapovalovVasek PospisilAlexis Galarneau | Australia | Alex de MinaurJordan ThompsonThanasi KokkinakisMax PurcellMatthew Ebden | 2–0 |