Stadium: Ochsenhausen, Germany
| Challenger Series TT | 2023/04/03 12:30 | Dennis Klein v Sven Happek | L | 3-1 |
| Challenger Series TT | 2023/03/06 19:30 | Sven Happek v Dennis Klein | L | 1-3 |
| Challenger Series TT | 2023/01/23 07:30 | Sven Happek v Dennis Klein | L | 1-3 |
| Challenger Series TT | 2023/01/09 14:10 | Sven Happek v Dennis Klein | L | 0-3 |
| Challenger Series TT | 2022/07/12 08:30 | Sven Happek v Dennis Klein | L | 1-3 |
| Challenger Ochsenhausen | 2022/06/23 06:30 | Dennis Klein v Sven Happek | L | 3-0 |
| Challenger Ochsenhausen | 2022/06/20 15:10 | Dennis Klein v Sven Happek | L | 3-1 |
| Challenger Ochsenhausen | 2022/05/12 12:30 | Dennis Klein v Sven Happek | L | 3-0 |
| Challenger Series TT | 2023/05/08 14:30 | Anton Andersson v Sven Happek | L | 3-2 |
| Challenger Series TT | 2023/05/08 11:50 | Tobias Slanina v Sven Happek | L | 3-1 |
| Challenger Series TT | 2023/05/08 09:50 | Sven Happek v Amirreza Abbasi | L | 1-3 |
| Challenger Series TT | 2023/05/08 07:50 | Sven Happek v Anton Limonov | L | 0-3 |
| Challenger Series TT | 2023/04/25 08:30 | Sven Happek v Alvaro Gainza | L | 0-3 |
| Challenger Series TT | 2023/04/24 19:50 | Sven Happek v Louis Price | L | 0-3 |
| Challenger Series TT | 2023/04/24 17:10 | Sven Happek v Max Klink | W | 3-0 |
| Challenger Series TT | 2023/04/24 14:30 | Kirill Fadeev v Sven Happek | W | 0-3 |
| Challenger Series TT | 2023/05/08 15:10 | Anton Limonov v Dennis Klein | W | 2-3 |
| Challenger Series TT | 2023/05/08 12:30 | Anton Andersson v Dennis Klein | L | 3-1 |
| Challenger Series TT | 2023/05/08 11:10 | Antonin Gavlas v Dennis Klein | L | 3-0 |
| Challenger Series TT | 2023/05/08 06:30 | Tobias Slanina v Dennis Klein | W | 0-3 |
| Challenger Series TT | 2023/05/05 13:30 | Dennis Klein v Benjamin Fruchart | W | 3-1 |
| Challenger Series TT | 2023/05/05 11:25 | Dennis Klein v Kirill Fadeev | W | 3-0 |
| Challenger Series TT | 2023/05/05 09:10 | Dennis Klein v Benjamin Fruchart | W | 3-0 |
| Challenger Series TT | 2023/05/04 19:50 | Dennis Klein v Akito Itagaki | W | 3-1 |