| Challenger Series TT | 2023/02/02 12:50 | Dennis Klein v Damian Zech | L | 3-0 |
| Challenger Series TT | 2022/10/06 12:30 | Damian Zech v Dennis Klein | L | 0-3 |
| Challenger Series TT | 2022/08/08 11:50 | Dennis Klein v Damian Zech | L | 3-1 |
| Challenger Series TT | 2022/08/01 09:50 | Damian Zech v Dennis Klein | L | 0-3 |
| Challenger Series TT | 2022/07/28 15:10 | Damian Zech v Dennis Klein | L | 0-3 |
| Challenger Ochsenhausen | 2022/06/20 07:50 | Damian Zech v Dennis Klein | L | 0-3 |
| Challenger Ochsenhausen | 2022/03/21 10:50 | Damian Zech v Dennis Klein | L | 0-3 |
| Challenger Ochsenhausen | 2021/12/13 08:10 | Dennis Klein v Damian Zech | L | 3-0 |
| Challenger Series TT | 2023/04/06 09:10 | Damian Zech v Kirill Fadeev | L | 0-3 |
| Challenger Series TT | 2023/04/06 06:30 | Damian Zech v Makoto Nogami | L | 1-3 |
| Challenger Series TT | 2023/03/10 10:10 | Damian Zech v Thibault Poret | L | 0-3 |
| Challenger Series TT | 2023/03/09 20:50 | Damian Zech v Guilherme Teodoro | L | 0-3 |
| Challenger Series TT | 2023/03/09 18:10 | Damian Zech v Samuel Amann | W | 3-2 |
| Challenger Series TT | 2023/03/09 15:30 | Karl Zimmermann v Damian Zech | L | 3-0 |
| Challenger Series TT | 2023/03/09 12:50 | Kirill Fadeev v Damian Zech | L | 3-0 |
| Challenger Series TT | 2023/03/09 10:50 | Damian Zech v Dimitrije Levajac | L | 0-3 |
| Challenger Series TT | 2023/04/06 09:50 | Dennis Klein v Dimitrije Levajac | L | 0-3 |
| Challenger Series TT | 2023/04/06 07:50 | Dennis Klein v Yonghun Lee | W | 3-1 |
| Challenger Series TT | 2023/04/04 12:10 | Dennis Klein v Amirreza Abbasi | W | 3-2 |
| Challenger Series TT | 2023/04/04 10:05 | Dennis Klein v Kirill Fadeev | W | 3-0 |
| Challenger Series TT | 2023/04/04 09:10 | Dennis Klein v Emiliano Riofrio | W | 3-0 |
| Challenger Series TT | 2023/04/04 07:10 | Dennis Klein v Dauud Cheaib | W | 3-0 |
| Challenger Series TT | 2023/04/03 17:50 | Dennis Klein v Florian Bourrassaud | L | 2-3 |
| Challenger Series TT | 2023/04/03 14:30 | Dennis Klein v Kirill Fadeev | W | 3-2 |