Stadium: COURT 1 Round: 19 Ground: Clay
| Challenger Warsaw | 2021/08/22 09:00 | Heyman, Christopher v Niklas-Salminen, Patrick | 6-1,6-3 |
| ITF M25 Koksijde | 2021/08/20 10:35 | Perchicot, Mathieu v Heyman, Christopher | 6-4,6-4 |
| ITF M25 Koksijde | 2021/08/19 08:00 | Heyman, Christopher v Aidan Mchugh | 7-6,6-4 |
| ITF M25 Koksijde | 2021/08/17 08:00 | Heyman, Christopher v Pisane, Tom | 6-0,6-3 |
| ITF M25 Koksijde | 2021/08/16 11:15 | Heyman, Christopher v Max Cunat | 6-2,6-2 |
| ITF M25 Wetzlar | 2021/08/08 10:00 | Peter Heller v Heyman, Christopher | 6-4,6-7,6-4 |
| ITF M25 Wetzlar | 2021/08/07 14:10 | Harold Mayot v Heyman, Christopher | 3-6,6-7 |
| ITF M25 Wetzlar | 2021/08/06 12:00 | Heyman, Christopher v Alexey Vatutin | 6-3,7-5 |
| Challenger Warsaw | 2021/08/22 09:00 | Marek, Wojciech v Daniel Michalski | 6-7,1-6 |
| ITF M15 Lodz | 2021/08/20 10:15 | Daniel Michalski v Soares Klier, Gilbert | 6-4,3-6,3-6 |
| ITF M15 Lodz | 2021/08/19 10:30 | Daniel Michalski v Szymon Kielan | 3-6,7-5,6-3 |
| ITF M15 Lodz | 2021/08/18 11:40 | Daniel Michalski v Piotr Grynkowski | 6-1,6-1 |
| ITF M15 Gdynia | 2021/08/13 12:00 | Daniel Michalski v Fabian Marozsan | 4-6,3-6 |
| ITF M15 Gdynia | 2021/08/12 10:30 | Daniel Michalski v Dembek, Michal | 7-6,4-6,6-3 |
| ITF M15 Gdynia | 2021/08/11 12:40 | Daniel Michalski v Ribeiro Marcondes, Igor | 6-2,6-3 |
| ITF M25 Grodzisk Mazowiecki | 2021/08/05 13:10 | Pavlasek, Adam v Daniel Michalski | 7-5,6-4 |