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Jérôme Cyrill Kym (born 12 February 2003) is a Swiss professional tennis player. He has a career-high ATP singles ranking of No. 123 and a doubles ranking of No. 192, both achieved on 19 May 2025. He is currently the No. 3 male singles player from Switzerland. Kym represents Switzerland at the Davis Cup, where he has a W/L record of 3–2.
| W | F | SF | QF | RR | Q# | DNQ | A | NH |
| Tournament | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 | SR | W–L | Win % |
| Grand Slam tournaments | |||||||||
| Australian Open | A | A | A | A | Q2 | Q2 | 0 / 0 | 0–0 | – |
| French Open | A | A | A | A | Q1 | 0 / 0 | 0–0 | – | |
| Wimbledon | A | A | A | A | Q1 | 0 / 0 | 0–0 | – | |
| US Open | A | A | A | Q3 | 3R | 0 / 1 | 2–1 | 67% | |
| Win–loss | 0–0 | 0–0 | 0–0 | 0–0 | 2–1 | 0–0 | 0 / 1 | 2–1 | 67% |
| National representation | |||||||||
| Davis Cup | G2 | A | A | G1 | G1 | 0 / 0 | 3–2 | 60% | |
| ATP Masters 1000 | |||||||||
| Indian Wells Open | A | A | A | A | A | A | 0 / 0 | 0–0 | – |
| Miami Open | A | A | A | A | A | 0 / 0 | 0–0 | – | |
| Monte-Carlo Masters | A | A | A | A | A | 0 / 0 | 0–0 | – | |
| Madrid Open | A | A | A | A | Q2 | 0 / 0 | 0–0 | – | |
| Italian Open | A | A | A | A | Q1 | 0 / 0 | 0–0 | – | |
| Canadian Open | A | A | A | A | A | 0 / 0 | 0–0 | – | |
| Cincinnati Open | A | A | A | A | A | 0 / 0 | 0–0 | – | |
| Shanghai Masters | NH | A | A | A | 0 / 0 | 0–0 | – | ||
| Paris Masters | A | A | A | A | A | 0 / 0 | 0–0 | – | |
| Win–loss | 0–0 | 0–0 | 0–0 | 0–0 | 0–0 | 0–0 | 0 / 0 | 0–0 | – |
| Career statistics | |||||||||
| 2021 | 2022 | 2023 | 2024 | 2025 | 2026 | SR | W–L | Win% | |
| Tournaments | 0 | 0 | 0 | 1 | 2 | 0 | Career total: 3 | ||
| Titles | 0 | 0 | 0 | 0 | 0 | 0 | Career total: 0 | ||
| Finals | 0 | 0 | 0 | 0 | 0 | 0 | Career total: 0 | ||
| Hard win–loss | 1–0 | 0–0 | 0–0 | 1–1 | 2–3 | 1–0 | 0 / 2 | 5–4 | 56% |
| Clay win–loss | 0–0 | 0–0 | 0–0 | 0–0 | 2–1 | 0–0 | 0 / 1 | 2–1 | 67% |
| Grass win–loss | 0–0 | 0–0 | 0–0 | 0–0 | 0–0 | 0–0 | 0 / 0 | 0–0 | – |
| Overall win–loss | 1–0 | 0–0 | 0–0 | 1–1 | 4–4 | 1–0 | 0 / 3 | 7–5 | 58% |
| Win % | 100% | – | – | 50% | 50% | 100% | 58 % | ||
| Year-end ranking | 1124 | 428 | 484 | 134 | 187 | $698,030 | |||
| Legend |
| ATP Challenger Tour (2–0) |
| Result | W–L | Date | Tournament | Tier | Surface | Opponent | Score |
| Win | 1–0 | Jun 2024 | Czech Open, Czech Republic | Challenger | Clay | Tseng Chun-hsin | 6–2, 3–6, 6–2 |
| Win | 2–0 | Jul 2024 | Zug Open, Switzerland | Challenger | Clay | Román Andrés Burruchaga | 6–4, 6–4 |
| Legend |
| ATP Challenger Tour (1–2) |