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