| German Championship | 2021/12/08 11:00 | Niklas Guttau v Michael Weindl | 4-6,6-3,1-6 |
| ITF M15 Heraklion | 2021/11/11 10:30 | Michael Weindl v Peter Fajta | 6-3,6-7,6-7 |
| ITF M15 Heraklion | 2021/11/10 08:30 | Simon A Ivanov v Michael Weindl | 7-5,1-6,1-6 |
| ITF M15 Heraklion | 2021/11/01 09:00 | Michael Weindl v Ioannis Papounidis | 3-6,6-2,3-10 |
| Challenger Ismaning | 2021/10/24 10:35 | Matthias Bachinger v Michael Weindl | 6-1,6-3 |
| ITF M15 Allershausen | 2021/09/01 09:00 | Dominik Boehler v Michael Weindl | 1-6,6-1,6-2 |
| ITF M15 Allershausen | 2021/08/31 08:00 | Anirudh Chandrasekar v Michael Weindl | 2-6,3-6 |
| ITF M25 Trimbach | 2021/03/08 09:00 | Jonas Schaer v Michael Weindl | 7-6,5-7,11-9 |
| German Championship | 2021/12/08 13:00 | Jannik Maute v Kai Wehnelt | 2-6,4-6 |
| ITF M15 Heraklion | 2021/12/03 08:00 | Kai Wehnelt v Charles Broom | 4-6,2-6 |
| ITF M15 Heraklion | 2021/12/02 07:00 | Kai Wehnelt v Pijus Vaitiekunas | 6-1,6-2 |
| ITF M15 Heraklion | 2021/12/01 07:00 | Kai Wehnelt v Dong Ju Kim | 6-4,7-6 |
| ITF M15 Heraklion | 2021/11/27 08:00 | Nicholas David Ionel v Kai Wehnelt | 7-6,6-3 |
| ITF M15 Heraklion | 2021/11/26 12:05 | Kai Wehnelt v Arthur Fery | 6-3,7-5 |
| ITF M15 Heraklion | 2021/11/25 07:30 | Kai Wehnelt v Marc Othman Ktiri | 6-1,6-4 |
| ITF M15 Heraklion | 2021/11/23 08:30 | Kai Wehnelt v Ioannis Kountourakis | 6-3,6-3 |