Estádio: Court 2 Round: 25 Ground: Clay
| ITF - M25 Frankfurt am Main | 2021/08/11 15:30 | Kai Wehnelt v Lucas Gerch | 6-3,2-6,4-6 |
| ITF - M25 Wetzlar | 2021/08/04 08:00 | Harold Mayot v Kai Wehnelt | 6-4,6-7,7-5 |
| ITF - M15 Cairo | 2021/07/29 08:00 | Gustavo Heide v Kai Wehnelt | 3-6,7-5,6-3 |
| ITF - M15 Cairo | 2021/07/28 14:20 | Facundo Arias Bisso v Kai Wehnelt | 5-7,5-7 |
| ITF - M15 Cairo | 2021/07/24 08:00 | Mathieu Perchicot v Kai Wehnelt | 6-3,1-6,7-5 |
| ITF - M15 Cairo | 2021/07/23 07:55 | Kai Wehnelt v Lorenzo Bocchi | 3-6,6-4,6-2 |
| ITF - M15 Cairo | 2021/07/22 08:00 | Kai Wehnelt v Leonid Sheyngezikht | 6-3,6-1 |
| ITF - M15 Cairo | 2021/07/21 08:00 | Kai Wehnelt v Artur Soghoyan | 6-3,6-3 |
| ITF - M15 Gdynia | 2021/08/13 09:00 | Roman Andres Burruchaga v Daniel De Jonge | 7-6,6-1 |
| ITF - M15 Gdynia | 2021/08/12 09:25 | Gilbert S K Junior v Daniel De Jonge | 5-7,1-6 |
| ITF - M15 Gdynia | 2021/08/11 08:00 | Daniel De Jonge v Markus Eriksson | 6-4,6-1 |
| ITF - M15 Gdynia | 2021/08/10 08:00 | Juliusz Bienkiewicz v Daniel De Jonge | 2-6,6-7 |
| ITF - M15 Gdynia | 2021/08/09 08:00 | Sergo Sikharulidze v Daniel De Jonge | 3-6,2-6 |
| ITF - M15 Gdynia | 2021/08/08 08:00 | Valerio Aboian v Daniel De Jonge | 5-7,6-7 |
| ITF - M15 Frederiksberg | 2021/08/05 10:25 | Christian Sigsgaard v Daniel De Jonge | 6-4,7-6 |
| ITF - M15 Frederiksberg | 2021/08/03 09:20 | Daniel De Jonge v Patrick Kypson | 6-3,7-6 |