Stadium: Court 2 Round: 26 Ground: Clay
| Challenger Warsaw | 2021/08/25 09:35 | Vitaliy Sachko v Michael Vrbensky | 6-2,6-7,4-6 |
| Challenger Luedenscheid | 2021/08/17 11:35 | Juan Manuel Cerundolo v Michael Vrbensky | 6-4,6-2 |
| Challenger Prague | 2021/08/10 12:00 | Michael Vrbensky v Evgeny Tyurnev | 4-6,2-6 |
| Challenger Liberec | 2021/08/02 13:35 | Michael Vrbensky v Marc Polmans | 7-6,2-6,5-7 |
| Challenger Trieste | 2021/07/27 13:00 | Flavio Cobolli v Michael Vrbensky | 7-6,6-3 |
| Challenger Amersfoort | 2021/07/15 13:05 | Tallon Griekspoor v Michael Vrbensky | 6-4,6-4 |
| Challenger Amersfoort | 2021/07/13 15:25 | Zizou Bergs v Michael Vrbensky | 4-6,6-7 |
| Challenger Salzburg | 2021/07/04 09:55 | Michael Vrbensky v Denis Yevseyev | 2-6,4-6 |
| Challenger Warsaw | 2021/08/25 10:40 | Jeroen Vanneste v Alexander Shevchenko | 6-3,2-6,7-5 |
| ITF M25 Telfs | 2021/07/14 07:55 | Jeroen Vanneste v Bogdan Ionut Apostol | 2-6,3-6 |
| Challenger Salzburg | 2021/07/05 09:00 | Jeroen Vanneste v Alexander Erler | 4-6,2-6 |
| Challenger Salzburg | 2021/07/04 11:10 | Yosuke Watanuki v Jeroen Vanneste | 3-6,2-6 |
| Challenger Prostejov | 2021/06/14 08:30 | Alex Rybakov v Jeroen Vanneste | 7-6,7-6 |
| Challenger Prostejov | 2021/06/13 11:25 | Adam Jurajda v Jeroen Vanneste | 6-4,6-7,1-6 |
| ITF M15 Antalya | 2021/05/05 08:25 | Jeroen Vanneste v Yanki Erel | 7-6,5-7,5-7 |
| ITF M15 Antalya | 2021/05/02 09:20 | Sandro Ehrat v Jeroen Vanneste | 4-6,3-6 |