Stadium: Ochsenhausen, Germany
| Challenger Series TT | 2022/08/08 09:10 | Dennis Klein v Michael Engelhardt | W | 3-0 |
| Challenger Series TT | 2022/08/02 08:30 | Dennis Klein v Michael Engelhardt | W | 3-0 |
| Challenger Series TT | 2022/07/29 08:30 | Michael Engelhardt v Dennis Klein | L | 3-2 |
| Challenger Series TT | 2022/07/11 11:10 | Michael Engelhardt v Dennis Klein | W | 1-3 |
| Challenger Series TT | 2022/06/16 06:30 | Michael Engelhardt v Dennis Klein | W | 1-3 |
| Challenger Ochsenhausen | 2021/07/28 11:50 | Michael Engelhardt v Dennis Klein | W | 0-3 |
| Challenger Ochsenhausen | 2021/07/26 18:00 | Michael Engelhardt v Dennis Klein | W | 0-3 |
| Challenger Ochsenhausen | 2021/06/10 07:10 | Michael Engelhardt v Dennis Klein | W | 0-3 |
| Challenger Series TT | 2023/04/07 12:50 | Yannick Vostes v Dennis Klein | W | 1-3 |
| Challenger Series TT | 2023/04/07 12:05 | Florian Bourrassaud v Dennis Klein | L | 3-0 |
| Challenger Series TT | 2023/04/07 09:10 | Dennis Klein v Yannick Vostes | W | 3-0 |
| Challenger Series TT | 2023/04/06 19:50 | Dennis Klein v Florian Bourrassaud | L | 2-3 |
| Challenger Series TT | 2023/04/06 17:10 | Dennis Klein v Makoto Nogami | W | 3-1 |
| Challenger Series TT | 2023/04/06 14:30 | Kirill Fadeev v Dennis Klein | W | 1-3 |
| Challenger Series TT | 2023/04/06 11:50 | Damian Zech v Dennis Klein | W | 0-3 |
| Challenger Series TT | 2023/04/06 09:50 | Dennis Klein v Dimitrije Levajac | L | 0-3 |
| Challenger Series TT | 2023/04/18 09:50 | Michael Engelhardt v Dillon Chambers | L | 2-3 |
| Challenger Series TT | 2023/04/18 06:30 | Michael Engelhardt v Siddharta Almeida | L | 1-3 |
| Challenger Series TT | 2023/04/17 17:50 | Michael Engelhardt v Dauud Cheaib | L | 1-3 |
| Challenger Series TT | 2023/04/17 16:30 | Michael Engelhardt v Simon Berglund | L | 0-3 |
| Challenger Series TT | 2023/04/17 11:50 | Michael Engelhardt v Sven Happek | L | 0-3 |
| Challenger Series TT | 2023/04/17 09:10 | Michael Engelhardt v Damian Zech | W | 3-0 |
| Challenger Series TT | 2023/04/17 06:30 | Michael Engelhardt v Makoto Nogami | W | 3-2 |
| Challenger Series TT | 2023/03/14 10:50 | Michael Engelhardt v Peter Hribar | L | 1-3 |