| ITF M25 Hamburg | 2021/10/21 09:55 | Louis Wessels v Kai Wehnelt | 7-5,4-6,6-3 |
| ITF M25 Hamburg | 2021/10/20 08:00 | Kai Wehnelt v Markus Eriksson | 6-4,7-5 |
| ITF M15 Sozopol | 2021/10/13 15:40 | Kai Wehnelt v Andrew Paulson | 6-7,1-6 |
| ITF M15 Sozopol | 2021/10/10 07:00 | Billy Harris v Kai Wehnelt | 6-4,6-1 |
| ITF M15 Sozopol | 2021/10/09 07:00 | Alexander Donski v Kai Wehnelt | 6-4,3-6,6-7 |
| ITF M15 Sozopol | 2021/10/08 07:00 | Kai Wehnelt v Ilya Snitari | 7-6,6-3 |
| ITF M15 Sozopol | 2021/10/07 07:00 | Kai Wehnelt v George Tsivadze | 6-3,6-1 |
| ITF M15 Sozopol | 2021/10/05 09:00 | Kai Wehnelt v Dian Nedev | 6-3,6-3 |