| Challenger Series TT | 2022/10/06 12:30 | Damian Zech v Dennis Klein | W | 0-3 |
| Challenger Series TT | 2022/08/08 11:50 | Dennis Klein v Damian Zech | W | 3-1 |
| Challenger Series TT | 2022/08/01 09:50 | Damian Zech v Dennis Klein | W | 0-3 |
| Challenger Series TT | 2022/07/28 15:10 | Damian Zech v Dennis Klein | W | 0-3 |
| Challenger Ochsenhausen | 2022/06/20 07:50 | Damian Zech v Dennis Klein | W | 0-3 |
| Challenger Ochsenhausen | 2022/03/21 10:50 | Damian Zech v Dennis Klein | W | 0-3 |
| Challenger Ochsenhausen | 2021/12/13 08:10 | Dennis Klein v Damian Zech | W | 3-0 |
| Challenger Series TT | 2023/02/02 10:10 | Dennis Klein v Kenan Hrnic | W | 3-0 |
| Challenger Series TT | 2023/02/02 07:30 | Dennis Klein v Kirill Fadeev | W | 3-1 |
| Challenger Series TT | 2023/01/23 12:10 | Enzo Angles v Dennis Klein | L | 3-1 |
| Challenger Series TT | 2023/01/23 07:30 | Sven Happek v Dennis Klein | W | 1-3 |
| Challenger Series TT | 2023/01/10 13:50 | Dennis Klein v Yannick Vostes | W | 3-0 |
| Challenger Series TT | 2023/01/10 12:25 | Yongyin Li v Dennis Klein | L | 3-0 |
| Challenger Series TT | 2023/01/10 11:30 | Yongyin Li v Dennis Klein | L | 3-0 |
| Challenger Series TT | 2023/01/10 07:30 | Yannick Vostes v Dennis Klein | L | 3-2 |
| Challenger Series TT | 2023/02/02 10:50 | Damian Zech v Anton Limonov | L | 0-3 |
| Challenger Series TT | 2023/02/02 08:50 | Damian Zech v Dillon Chambers | L | 1-3 |
| Challenger Series TT | 2023/01/31 10:10 | Damian Zech v Albert Vilardell | L | 0-3 |
| Challenger Series TT | 2023/01/30 20:50 | Damian Zech v Josip Huzjak | L | 1-3 |
| Challenger Series TT | 2023/01/30 18:10 | Damian Zech v Samuel Amann | W | 3-0 |
| Challenger Series TT | 2023/01/30 15:30 | Makoto Nogami v Damian Zech | L | 3-2 |
| Challenger Series TT | 2023/01/30 12:50 | Florian Bluhm v Damian Zech | L | 3-0 |
| Challenger Series TT | 2023/01/30 10:50 | Damian Zech v Guilherme Teodoro | L | 0-3 |