Stadium: CC Round: 25 Ground: Clay
| ITF M15 Oldenzaal | 2021/08/18 14:30 | Kai Wehnelt v Daniel De Jonge | 5-7,6-1,6-7 |
| 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 Antalya | 2021/06/01 10:20 | Nicolas Moreno De Alboran v Sarp Agabigun | 6-4,6-4 |
| ITF M15 Tbilisi | 2021/05/20 06:00 | Sarp Agabigun v Justin Roberts | 4-6,6-2,6-7 |
| ITF M15 Tbilisi | 2021/05/18 07:00 | Andrey Chepelev v Sarp Agabigun | 2-6,4-6 |
| ITF M15 St Petersburg | 2021/04/16 09:30 | Yanki Erel v Sarp Agabigun | 6-4,6-1 |
| ITF M15 St Petersburg | 2021/04/15 10:25 | Sarp Agabigun v Konstantin Kravchuk | 5-7,6-2,6-3 |
| ITF M15 St Petersburg | 2021/04/13 09:00 | Timur Kiyamov v Sarp Agabigun | 6-7,4-6 |
| ITF M15 St Petersburg | 2021/04/12 07:00 | Sarp Agabigun v Dominik Recek | 6-4,6-2 |
| ITF M15 St Petersburg Qual | 2021/04/11 09:20 | Sarp Agabigun v Mert Alkaya | 6-4,6-3 |