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Yosuke Watanuki (綿貫 陽介, Watanuki Yōsuke; born 12 April 1998) is a Japanese professional tennis player. He has a career-high ATP ranking of World No. 72 achieved on 30 October 2023 and a doubles ranking of No. 374 achieved on 7 January 2019. He is currently the No. 5 Japanese player.
| W | F | SF | QF | | RR | Q# | DNQ | A | NH |
| Tournament | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | SR | W–L | Win % |
| Grand Slam tournaments | |||||||||||
| Australian Open | A | Q3 | A | A | Q2 | 2R | 1R | Q2 | 0 / 2 | 1–2 | 33% |
| French Open | A | Q3 | Q1 | A | A | Q2 | A | A | 0 / 0 | 0–0 | – |
| Wimbledon | Q1 | Q3 | NH | A | A | 2R | A | Q3 | 0 / 1 | 1–1 | 50% |
| US Open | A | Q2 | A | A | A | 1R | A | Q1 | 0 / 1 | 0–1 | 0% |
| Win–loss | 0–0 | 0–0 | 0–0 | 0–0 | 0–0 | 2–3 | 0–1 | 0–0 | 0 / 4 | 2–4 | 33% |
| ATP Masters 1000 | |||||||||||
| Indian Wells Masters | A | A | NH | A | A | Q1 | A | 4R | 0 / 1 | 3–1 | 75% |
| Miami Open | A | A | NH | A | A | 2R | A | Q1 | 0 / 1 | 1–1 | 50% |
| Monte Carlo Masters | A | A | NH | A | A | A | A | A | 0 / 0 | 0–0 | – |
| Madrid Open | A | A | NH | A | A | 2R | A | A | 0 / 1 | 1-1 | 50% |
| Italian Open | A | A | A | A | A | A | A | A | 0 / 0 | 0–0 | – |
| Canadian Open | A | A | NH | A | A | A | A | 2R | 0 / 1 | 1–1 | 50% |
| Cincinnati Masters | A | A | A | A | A | A | A | Q1 | 0 / 0 | 0–0 | – |
| Shanghai Masters | A | A | NH | 2R | 3R | Q2 | 0 / 2 | 3–2 | 60% | ||
| Paris Masters | A | A | A | A | A | Q1 | A | A | 0 / 0 | 0–0 | – |
| Win–loss | 0–0 | 0–0 | 0–0 | 0–0 | 0–0 | 3–3 | 2–1 | 4–2 | 0 / 6 | 9–6 | 60% |
| Legend (singles) |
| ATP Challenger Tour (4–4) |
| ITF Futures Tour (5–1) |
| Titles by surface |
| Hard (9–5) |
| Clay (0–0) |
| Result | W–L | Date | Tournament | Tier | Surface | Opponent | Score |
| Win | 1–0 | Apr 2016 | Japan F4, Tsukuba | Futures | Hard | Shintaro Imai | 1–6, 6–4, 6–2 |
| Win | 2–0 | Apr 2016 | Japan F5, Kashiwa | Futures | Hard | Makoto Ochi | 6–3, 6–3 |
| Win | 3–0 | Jun 2017 | Japan F7, Tokyo | Futures | Hard | Kento Takeuchi | 4–6, 6–1, 6–4 |
| Loss | 3–1 | Jun 2017 | Chinese Taipei F1, Taipei | Futures | Hard | Daniel Nguyen | 6–7(8–10), 1–6 |
| Win | 4–1 | Jun 2017 | Chinese Taipei F2, Taipei | Futures | Hard | Yusuke Takahashi | 6–2, 6–3 |
| Win | 5–1 | Apr 2018 | Japan F4, Tsukuba | Futures | Hard | Renta Tokuda | 7–5, 6–1 |
| Loss | 5–2 | Nov 2018 | Kobe, Japan | Challenger | Hard (i) | Tatsuma Ito | 6–3, 5–7, 3–6 |
| Win | 6–2 | Nov 2019 | Kobe, Japan | Challenger | Hard (i) | Yūichi Sugita | 6–2, 6–4 |
| Loss | 6–3 | Feb 2020 | Cleveland, USA | Challenger | Hard (i) | Mikael Torpegaard | 3–6, 6–1, 1–6 |
| Loss | 6–4 | Oct 2022 | Yokohama, Japan | Challenger | Hard | Christopher O'Connell | 1–6, 7–6(7–5), 3–6 |
| Win | 7–4 | Nov 2022 | Kobe, Japan | Challenger | Hard (i) | Frederico Ferreira Silva | 6–7(3–7), 7–5, 6–4 |
| Win | 8–4 | Nov 2022 | Yokkaichi, Japan | Challenger | Hard | Frederico Ferreira Silva | 6–2, 6–2 |
| Loss | 8–5 | Sep 2023 | Shanghai, China | Challenger | Hard | Christopher O'Connell | 3–6, 5–7 |
| Win | 9–5 | Nov 2023 | Yokohama, Japan | Challenger | Hard | Yuta Shimizu | 7–6(7–5), 6–4 |
| Result | Year | Tournament | Surface | Opponent | Score |
| Silver | 2022 | Asian Games | Hard | Zhang Zhizhen | 4–6, 6–7(7–9) |