| Czechia Extraliga | 12/17 09:00 | - | Jonas Forejtek v Milos Karol | 6-7,6-7 | |
| Czechia Extraliga | 12/16 09:00 | - | Hynek Barton v Jonas Forejtek | 7-5,6-4 | |
| Challenger Maia | 11/23 11:10 | 14 | Sergi Perez Contri v Jonas Forejtek | 6-4,6-4 | |
| Challenger Montemar | 11/17 09:30 | 19 |
[403] Cezar Cretu
v
Jonas Forejtek [440] |
3-6,6-3,6-2 | |
| Challenger Montemar | 11/16 09:30 | 14 | Mario G Fernandez v Jonas Forejtek | 4-6,3-6 | |
| ITF M25 Glasgow | 10/31 10:00 | - | [442] Jonas Forejtek v Alastair Gray [361] | 4-6,3-6 | |
| ITF M25 Glasgow | 10/30 12:14 | - |
Maxime Janvier
v
Jonas Forejtek |
6-7,6-7 | |
| ITF M25 Glasgow | 10/29 15:08 | - | [418] Mae Malige v Jonas Forejtek [442] | 6-7,4-6 | |
| Challenger Brest | 10/21 15:45 | 25 |
[455] Jonas Forejtek v
Eliot Spizzirri
[103]
|
6-3,6-7,3-6 | |
| Challenger Brest | 10/20 10:50 | 19 | [455] Jonas Forejtek v David Jorda Sanchis [450] | 6-1,6-4 | |
| Challenger Brest | 10/19 14:35 | 14 |
[289] Mikhail Kukushkin
v
Jonas Forejtek [453] |
3-6,6-7 | |
| Challenger Brest | 10/19 12:40 | 14 |
Chun Hsin Tseng
v
Jonas Forejtek |
CANC |
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.