Stadium: Court 1 Round: 26 Ground: Clay
| ITF M25 Prague | 2021/10/05 12:45 | Jakub Paul v Ondrej Krstev | 7-5,6-4 |
| ITF M25 Falun | 2021/09/28 12:40 | Jakub Paul v Shintaro Imai | 3-6,0-6 |
| Challenger Biel | 2021/09/21 10:00 | Jakub Paul v Alexander Ritschard | 4-6,4-6 |
| Challenger Biel | 2021/09/20 09:00 | Tobias Simon v Jakub Paul | 4-6,4-6 |
| Challenger Biel | 2021/09/19 09:30 | Jakub Paul v Christopher Heyman | 7-6,4-6,7-5 |
| ITF M25 Sierre | 2021/09/02 09:30 | Patrick Kypson v Jakub Paul | 4-6,6-1,6-1 |
| ITF M25 Sierre | 2021/09/01 11:10 | Jakub Paul v Pietro Rondoni | 7-6,6-3 |
| ITF M25 Caslano | 2021/08/26 08:30 | Alejandro Gonzalez v Jakub Paul | 6-2,7-5 |
| ITF M25 Prague | 2021/10/06 12:10 | Martin Krumich v Marek Gengel | 7-5,5-7,4-6 |
| Challenger Orleans | 2021/09/26 12:50 | Maxime Janvier v Marek Gengel | 6-2,7-5 |
| Challenger Biel | 2021/09/19 12:40 | Alexander Shevchenko v Marek Gengel | 6-3,6-3 |
| Challenger Rennes | 2021/09/12 08:00 | Kenny de Schepper v Marek Gengel | 6-4,6-1 |
| Challenger Tulln | 2021/09/05 10:25 | Mate Valkusz v Marek Gengel | 6-0,6-1 |
| ITF M25 Ricany | 2021/09/03 08:25 | Marek Gengel v Yshai Oliel | 3-6,6-4,4-6 |
| ITF M25 Ricany | 2021/09/02 07:55 | Filip Duda v Marek Gengel | 3-6,3-6 |
| ITF M25 Ricany | 2021/09/01 09:05 | Marek Gengel v Daniel Siniakov | 7-5,6-3 |