Jonáš Forejtek

Jonáš Forejtek (born 10 March 2001) is a professional tennis player from the Czech Republic. Forejtek has a career high ATP singles ranking of World No. 217, achieved on 1 August 2022. He also has a career high ATP doubles ranking of No. 300, achieved on 27 October 2025. He won the 2019 Junior singles US Open. He reached the ITF world No. 1 Junior combined ranking on 9 September 2019.

Forejtek has reached ten career singles finals, with a record of 5 wins and 5 losses all on the ITF Futures Tour. Additionally, he has reached ten career doubles finals, with a record of 8 wins and 2 losses which includes a 5–1 record in ATP Challenger Tour finals.

Junior career

In 2019, Forejtek reached three junior Grand Slam finals, one in singles and two in doubles, winning them all. At the 2019 Australian Forejtek and compatriot partner Dalibor Svrčina won the boys' doubles title beating Americans Emilio Nava and Cannon Kingsley 7–6(7–5), 6–4 in the finals. At the 2019 Wimbledon Championships he partnered with another compatriot Jiří Lehečka capturing his second boys' grand slam doubles title, defeating Govind Nanda and Liam Draxl 7–5, 6–4 in the championship match. At the 2019 US Open, he defeated Emilio Nava 6–7(4–7), 6–0, 6–2 in the final to win the boys’ singles championship.

Forejtek was the World No. 1 male junior player according to the ITF combined singles and doubles junior rankings, achieved on 9 September 2019.

Professional career 2019 As wildcard entrants, Forejtek and fellow Czech Michael Vrbenský won the doubles title at the 2019 Svijany Open challenger tournament in Liberec, Czech Republic. Impressively, they defeated the number 3 seeds in the quarterfinals (second round), the number 1 seeds in the semifinals and then claimed the title by bettering the number 2 seeds Nikola Ćaćić and Antonio Šančić 6–4, 6–3 in the final.

2020–2021: ATP, top 300 debut in singles Forejtek made his ATP debut at 2020 Sofia Open receiving a wildcard entry into the singles main draw. He proceeded to claim an upset victory over former World No. 3 Marin Čilić in the first round, losing just 5 games. He was then defeated by another former top 10 player Richard Gasquet in the second round.

Forejtek made his debut in the top 300 on 1 November 2021 at World No. 294.

2022: Top 250 debut He made his top 250 debut on 16 May 2022 at No. 226 following a semifinal showing as a qualifier at the 2022 Heilbronner Neckarcup Challenger in Germany.

2025: Challenger 125 title, top 300 in doubles Forejtek won his biggest ATP Challenger doubles title at the 2025 Copa Sevilla with Dominik Kellovský.

Junior Grand Slam finals Singles: 1 (1 title) ResultYearTournamentSurfaceOpponentScoreWin 2019 US Open Hard Emilio Nava 6–7(4–7), 6–0, 6–2

Doubles: 2 (2 titles) ResultYearTournamentSurfacePartnerOpponentsScoreWin 2019 Australian Open Hard Dalibor Svrčina Cannon Kingsley Emilio Nava 7–6(7–5), 6–4Win 2019 Wimbledon Grass Jiří Lehečka Liam Draxl Govind Nanda 7–5, 6–4

ATP Challenger and ITF Tour finals

Singles: 11 (5–6) Legend (singles)ATP Challenger Tour (0–0)ITF Futures Tour (5–6)Finals by surfaceHard (0–2)Clay (5–3)Grass (0–0)Carpet (0–1)

Doubles: 12 (9–3) Legend (doubles)ATP Challenger Tour (5–2)ITF Futures Tour (4–1)Finals by surfaceHard (1–1)Clay (8–1)Grass (0–0)Carpet (0–1)

Performance timeline

Singles Current through the 2020 Sofia Open