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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 world No. 123 and a doubles ranking of No. 192 both achieved on 19 May 2025. He is currently the No. 3 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 | SR | W–L | Win % | |
| Grand Slam tournaments | |||||||||
| Australian Open | A | A | A | A | 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 / 1 | 2–1 | 67% | |
| National representation | |||||||||
| Davis Cup | G2 | A | A | G1 | G1 | 0 / 0 | 2–2 | 50% | |
| ATP Masters 1000 | |||||||||
| Indian Wells Open | 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 | 0 / 0 | 0–0 | – | ||
| Win–loss | 0–0 | 0–0 | 0–0 | 0–0 | 0–0 | 0 / 0 | 0–0 | – | |
| Career statistics | |||||||||
| 2021 | 2022 | 2023 | 2024 | 2025 | SR | W–L | Win% | ||
| Tournaments | 0 | 0 | 0 | 1 | 2 | Career total: 3 | |||
| Titles | 0 | 0 | 0 | 0 | 0 | Career total: 0 | |||
| Finals | 0 | 0 | 0 | 0 | 0 | Career total: 0 | |||
| Hard win–loss | 1–0 | 0–0 | 0–0 | 1–1 | 2–3 | 0 / 2 | 4–4 | 50% | |
| Clay win–loss | 0–0 | 0–0 | 0–0 | 0–0 | 2–1 | 0 / 1 | 2–1 | 67% | |
| Grass win–loss | 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 | 0 / 3 | 6–5 | 55% | |
| Win % | 100% | – | – | 50% | 50% | 54.55% | |||
| Year-end ranking | 1124 | 428 | 484 | 134 | mw- $640,189 | ||||
| Legend |
| ATP Challenger Tour (2–0) |
| Result | W–L | Date | Tournament | Surface | Opponent | Score |
| Win | 1–0 | Jun 2024 | Czech Open, Czech Republic | Clay | Tseng Chun-hsin | 6–2, 3–6, 6–2 |
| Win | 2–0 | Jul 2024 | Zug Open, Switzerland | Clay | Román Andrés Burruchaga | 6–4, 6–4 |
| Legend |
| ATP Challenger Tour (1–2) |
| Finals by surface |
| Hard (0–2) |
| Clay (1–0) |
| Result | W–L | Date | Tournament | Surface | Partner | Opponents | Score |
| Loss | 0–1 | Mar 2022 | Challenger di Lugano, Switzerland | Hard (i) | Leandro Riedi | Ruben Bemelmans Daniel Masur | 4–6, 7–6(7–5), [7–10] |
| Loss | 0–2 | Jan 2025 | Canberra Tennis International, Australia | Hard | Pierre-Hugues Herbert | Ryan Seggerman Eliot Spizzirri | 6–1, 5–7, [5–10] |
| Win | 1–2 | Apr 2025 | Danube Upper Austria Open, Austria | Clay | Nico Hipfl | David Stevenson Ryan Seggerman | 7–5, 3–6, [10–2] |
| Legend |
| ITF WTT (3–4) |
| Finals by surface |
| Hard (2–3) |
| Clay (1–1) |
| Result | W–L | Date | Tournament | Surface | Opponent | Score |
| Loss | 0–1 | Jun 2022 | M15 Heraklion, Greece | Hard | Omar Jasika | 2–6, 2–6 |
| Loss | 0–2 | Sep 2022 | M25 Setúbal, Portugal | Hard | Adrià Soriano Barrera | 6–7(7–9), 3–6 |
| Loss | 0–3 | Sep 2022 | M25 Plaisir, France | Hard (i) | Antoine Hoang | 6–7(0–7), 3–6 |
| Win | 1–3 | Apr 2023 | M25 Trento, Italy | Hard (i) | Alastair Gray | 7–6(9–7), 6–2 |
| Win | 2–3 | Jan 2024 | M15 Manacor, Spain | Hard | Pol Martín Tiffon | 6–4, 6–2 |
| Win | 3–3 | Apr 2024 | M15 Antalya, Turkey | Clay | Yanaki Milev | 7–5, 6–2 |
| Loss | 3–4 | May 2024 | M15 Villach, Austria | Clay | Justin Engel | 3–6, 6–3, 3–6 |
| Legend |
| ITF WTT (2–3) |
| Finals by surface |
| Hard (0–1) |
| Clay (2–2) |
| Result | W–L | Date | Tournament | Surface | Partner | Opponents | Score |
| Loss | 0–1 | May 2022 | M15 Antalya, Turkey | Clay | Maks Kaśnikowski | Bruno Kuzuhara Victor Lilov | walkover |
| Loss | 0–2 | Apr 2023 | M25 Split, Croatia | Clay | Maks Kaśnikowski | Piotr Matuszewski Oleg Prihodko | 2–6, 6–7(6–8) |
| Loss | 0–3 | Jan 2024 | M15 Manacor, Spain | Hard | Adrià Soriano Barrera | Michiel de Krom Ryan Nijboer | 4–6, 6–4, [9–11] |
| Win | 1–3 | Apr 2024 | M25 Hammamet, Tunisia | Clay | Raphaël Collignon | Luca Giacomini Giuseppe Tresca | 6–4, 7–5 |
| Win | 2–3 | May 2024 | M15 Villach, Austria | Clay | Nico Hipfl | Adrian Oetzbach Miloš Karol | 6–4, 6–3 |