Stadium: Court 7 Round: 25 Ground: Hardcourt outdoor
| ITF M25 Alkmaar | 2021/06/24 08:00 | Mats Rosenkranz v Kai Wehnelt | 6-1,4-6,5-7 |
| ITF M25 Alkmaar | 2021/06/23 16:10 | Kai Wehnelt v Sander Jong | 6-2,7-6 |
| ITF M25 Alkmaar | 2021/06/21 16:00 | Kai Wehnelt v Deney Wassermann | 5-7,6-3,12-10 |
| ITF M15 Bucharest | 2021/05/26 08:30 | Kai Wehnelt v Cristian Rodriguez | 6-7,3-6 |
| ITF M15 Troisdorf | 2021/05/13 09:00 | Kai Wehnelt v Lucas Gerch | 4-6,6-4,5-7 |
| ITF M15 Troisdorf | 2021/05/11 12:35 | Tomas Lipovsek Puches v Kai Wehnelt | 1-6,7-6,3-6 |
| ITF M15 Cairo | 2021/05/06 07:50 | Jose Fco. Vidal Azorin v Kai Wehnelt | 6-4,6-3 |
| ITF M15 Cairo | 2021/05/05 09:45 | Hanwen Li v Kai Wehnelt | 3-6,4-6 |
| Challenger Prostejov | 2021/06/14 14:20 | Andrew Paulson v Hugo Dellien | 1-6,3-6 |
| ITF M25 Most | 2021/05/27 07:55 | Gijs Brouwer v Andrew Paulson | 6-2,2-6,7-6 |
| ITF M25 Most | 2021/05/26 09:50 | Andrew Paulson v Christian Lindell | 6-2,6-3 |
| ITF M25 Jablonec Nad Nisou | 2021/05/21 09:00 | Andrew Paulson v Evan Furness | 0-6,3-6 |
| ITF M25 Jablonec Nad Nisou | 2021/05/20 07:55 | Andrew Paulson v Titouan Droguet | 6-4,6-2 |
| ITF M25 Jablonec Nad Nisou | 2021/05/19 08:00 | Jonas Forejtek v Andrew Paulson | 6-2,3-6,1-6 |
| ITF M25 Jablonec Nad Nisou | 2021/05/18 07:30 | Andrew Paulson v Kai Lemstra | 6-3,6-4 |
| ITF M25 Jablonec Nad Nisou | 2021/05/17 08:30 | Andrew Paulson v Leon Hoeveler | 6-1,6-2 |