| Challenger Series TT | 2023/01/12 10:10 | Damian Zech v Sven Happek | L | 1-3 |
| Challenger Series TT | 2022/12/05 15:30 | Damian Zech v Sven Happek | W | 3-2 |
| Challenger Series TT | 2022/12/01 08:50 | Sven Happek v Damian Zech | L | 3-0 |
| Challenger Series TT | 2022/09/19 19:50 | Damian Zech v Sven Happek | L | 0-3 |
| Challenger Ochsenhausen | 2022/06/27 13:50 | Sven Happek v Damian Zech | L | 3-1 |
| Challenger Ochsenhausen | 2022/06/20 17:10 | Damian Zech v Sven Happek | L | 2-3 |
| Challenger Ochsenhausen | 2022/01/20 18:10 | Sven Happek v Damian Zech | W | 2-3 |
| Challenger Ochsenhausen | 2021/12/13 15:40 | Sven Happek v Damian Zech | L | 3-0 |
| Challenger Series TT | 2023/04/17 12:30 | Damian Zech v Makoto Nogami | W | 3-2 |
| Challenger Series TT | 2023/04/17 09:10 | Michael Engelhardt v Damian Zech | L | 3-0 |
| Challenger Series TT | 2023/04/17 07:10 | Damian Zech v Dillon Chambers | L | 0-3 |
| Challenger Series TT | 2023/04/07 09:50 | Damian Zech v Dimitrije Levajac | L | 0-3 |
| Challenger Series TT | 2023/04/07 06:30 | Damian Zech v Yonghun Lee | L | 1-3 |
| Challenger Series TT | 2023/04/06 17:50 | Damian Zech v Florian Bourrassaud | L | 1-3 |
| Challenger Series TT | 2023/04/06 16:30 | Damian Zech v Yannick Vostes | L | 0-3 |
| Challenger Series TT | 2023/04/06 11:50 | Damian Zech v Dennis Klein | L | 0-3 |
| Challenger Series TT | 2023/04/17 11:50 | Michael Engelhardt v Sven Happek | W | 0-3 |
| Challenger Series TT | 2023/04/17 09:50 | Sven Happek v Dillon Chambers | L | 1-3 |
| Challenger Series TT | 2023/04/17 07:50 | Sven Happek v Siddharta Almeida | L | 2-3 |
| Challenger Series TT | 2023/04/03 12:30 | Dennis Klein v Sven Happek | L | 3-1 |
| Challenger Series TT | 2023/04/03 11:10 | Dauud Cheaib v Sven Happek | L | 3-0 |
| Challenger Series TT | 2023/04/03 06:30 | Pekka Pelz v Sven Happek | L | 3-0 |
| TT Star Series | 2023/03/25 11:15 | Henning Zeptner v Sven Happek | W | 0-3 |
| TT Star Series | 2023/03/25 08:10 | Sven Happek v Antonin Gavlas | L | 0-3 |