Stadium: Court 9 Round: 62 Ground: Clay
| ITF M15 - Łódź | 2021/08/16 08:00 | Harry Wendelken v Mikolaj Borkowski | 6-0,6-3 |
| ITF M15 - Gdynia | 2021/08/10 08:00 | Luke Johnson v Harry Wendelken | 6-3,6-7,10-5 |
| ITF M15 - Gdynia | 2021/08/09 08:00 | Dominik Nazaruk v Harry Wendelken | 1-6,1-6 |
| ITF M15 - Gdynia | 2021/08/08 08:00 | Yann Wojcik v Harry Wendelken | 6-7,1-6 |
| ITF - M25 Idanha-A-Nova | 2021/07/11 13:00 | Francisco Rocha v Harry Wendelken | 7-6,6-4 |
| ITF M15 Almada | 2021/07/09 08:30 | Harry Wendelken v Daniel Cox | 2-6,1-6 |
| ITF M15 Almada | 2021/07/08 08:30 | Martim L Prata v Harry Wendelken | 4-6,6-7 |
| ITF M15 Almada | 2021/07/07 08:30 | Martin Breysach v Harry Wendelken | 3-6,3-6 |
| ITF M15 - Łódź | 2021/08/16 08:00 | Kamil Gajewski v Krystof Zapsky | 6-3,6-3 |
| ITF M15 - Łódź | 2021/08/15 08:00 | Kamil Gajewski v Alessio Vasquez Gehrke | 6-2,6-4 |
| ITF M15 - Gdynia | 2021/08/08 08:00 | Dominik Recek v Kamil Gajewski | 6-2,7-6 |
| ITF M25 - Wrocław | 2021/06/27 15:30 | Kamil Gajewski v Daniel Siniakov | 2-6,5-7 |
| Polish National Tour | 2020/08/23 12:30 | Daniel Michalski v Kamil Gajewski | 6-7,7-6,7-6 |
| Polish National Tour | 2020/08/23 08:00 | Kamil Gajewski v Jasza Szajrych | 6-4,6-1 |
| Polish National Tour | 2020/08/21 11:55 | Kamil Gajewski v Piotr Matuszewski | 7-6,6-4 |
| Polish National Tour | 2020/08/15 16:00 | Kamil Gajewski v Mikolaj Borkowski | 6-4,6-3 |