Jonáš Forejtek (born 10 March 2001) is a professionaltennis player from theCzech Republic.[1] Forejtek has a career highATP singles ranking of World No. 217, achieved on 1 August 2022. He also has a career highATP doubles ranking of No. 300, achieved on 27 October 2025. He won the2019 Junior singles US Open. He reached theITF 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 theITF 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 inATP Challenger Tour finals.
In 2019, Forejtek reached three junior Grand Slam finals, one in singles and two in doubles, winning them all. At the2019 Australian Forejtek and compatriot partnerDalibor Svrčina won the boys' doubles title beating AmericansEmilio Nava andCannon Kingsley7–6(7–5), 6–4 in the finals. At the2019 Wimbledon Championships he partnered with another compatriotJiří Lehečka capturing his second boys' grand slam doubles title, defeatingGovind Nanda andLiam Draxl7–5, 6–4 in the championship match. At the2019 US Open, he defeatedEmilio Nava6–7(4–7), 6–0, 6–2 in the final to win the boys’ singles championship.[2]
Forejtek was the World No. 1 male junior player according to the ITF combined singles and doubles junior rankings, achieved on 9 September 2019.[3]
As wildcard entrants, Forejtek and fellow CzechMichael Vrbenský won the doubles title at the2019 Svijany Open challenger tournament inLiberec, 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 seedsNikola Ćaćić andAntonio Šančić6–4, 6–3 in the final.
Forejtek made his ATP debut at2020 Sofia Open receiving a wildcard entry into the singles main draw. He proceeded to claim an upset victory over former World No. 3Marin Čilić in the first round, losing just 5 games. He was then defeated by another former top 10 playerRichard Gasquet in the second round.
Forejtek made his debut in the top 300 on 1 November 2021 at World No. 294.
He made his top 250 debut on 16 May 2022 at No. 226 following a semifinal showing as a qualifier at the2022 Heilbronner Neckarcup Challenger in Germany.
(W) winner; (F) finalist; (SF) semifinalist; (QF) quarterfinalist; (#R) rounds 4, 3, 2, 1; (RR) round-robin stage; (Q#) qualification round; (P#) preliminary round; (DNQ) did not qualify; (A) absent; (Z#) Davis/Fed Cup Zonal Group (with number indication) or (PO) play-off; (G) gold, (S) silver or (B) bronze Olympic/Paralympic medal; (NMS) not a Masters tournament; (NTI) not a Tier I tournament; (P) postponed; (NH) not held; (SR) strike rate (events won / competed); (W–L) win–loss record.
To avoid confusion and double counting, these charts are updated at the conclusion of a tournament or when the player's participation has ended.
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Czech Republic
Emilio Nava
Liam Draxl
Karol Drzewiecki
Christopher O'Connell
Camilo Ugo Carabelli
Ruben Bemelmans
Nikolás Sánchez Izquierdo
Louis Wessels
Jacob Fearnley
Branko Đurić
Antonio Šančić
Niels Lootsma
Fábián Marozsán
Evgeny Karlovskiy
Victor Vlad Cornea
Miloš Karol