Jonáš Forejtek (born 10 March 2001) is a professional tennis player from the Czech Republic.[1] 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 World No. 302, achieved on 28 February 2022. Forejtek has reached five career singles finals, with a record of 2 wins and 3 losses all on the ITF Futures Tour. Additionally, he has reached five career doubles finals, with a record of 4 wins and 1 loss which includes a 2–0 record in ATP Challenger Tour finals.
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 Kingsley7–6(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 Draxl7–5, 6–4 in the championship match. At the 2019 US Open, he defeated Emilio Nava6–7(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, achieving this feat on 9 September 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 Šančić6–4, 6–3 in the final.
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.
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.
(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
Nikola Ćaćić
Antonio Šančić
Niels Lootsma
Fábián Marozsán
Evgeny Karlovskiy
Victor Vlad Cornea
