Jérôme Kym

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. 4 male singles player from Switzerland.

Kym represents Switzerland at the Davis Cup, where he has a W/L record of 3–2.

Junior career Kym had successful results on the ITF junior circuit, maintaining a 93–27 singles win-loss record. He reached an ITF junior combined ranking of world No. 5 on 11 October 2021.

Professional career

2019: Davis Cup debut In February 2019, partnering Henri Laaksonen, they defeated the Russian duo of Evgeny Donskoy and Andrey Rublev in his first doubles Davis Cup tie.

2024-2025: ATP, Top 125, Major debut and third round Kym won his maiden Challenger title at the 2024 UniCredit Czech Open as a qualifier defeating Tseng Chun-hsin. Following his second Challenger title at the 2024 Zug Open he reached the top 200 at world No. 181 on 29 July 2024.

At the 2024 Swiss Indoors in Basel, Kym qualified for his first ATP and ATP 500 main draw but lost to fifth seed Ugo Humbert. He reached the top 125 at world No. 123 on 19 May 2025, following the 2025 Italian Open. Kym recorded his first ATP wins at the 2025 Swiss Open Gstaad as a wildcard, over qualifiers Calvin Hemery and Francesco Passaro to reach his first ATP Tour quarterfinal.

Kym qualified for his first Grand Slam main draw at the 2025 US Open and defeated Ethan Quinn for his first major win. He defeated 30th seed Brandon Nakashima in a five-set match to reach the third round of a major for the first time in his debut. He was eliminated in the third round after a four-set defeat to world number four Taylor Fritz. In total, he earned around 237,000 US dollars in prize money.

Performance timelines

Singles Current through the 2026 French Open.

ATP Challenger Tour finals

Singles: 3 (2 titles, 1 runner-up) LegendATP Challenger Tour (2–1)

Doubles: 3 (1 title, 2 runner-ups) LegendATP Challenger Tour (1–2)Finals by surfaceHard (0–2)Clay (1–0)

ITF World Tennis Tour finals

Singles: 7 (3 titles, 4 runner-ups) LegendITF WTT (3–4)Finals by surfaceHard (2–3)Clay (1–1)

Doubles: 5 (2 titles, 3 runner-ups) LegendITF WTT (2–3)Finals by surfaceHard (0–1)Clay (2–2)