Stadium: Ochsenhausen, Germany
| Challenger Series TT | 2023/06/19 09:10 | Dennis Klein v Sven Happek | W | 3-1 |
| Challenger Series TT | 2023/05/08 17:10 | Sven Happek v Dennis Klein | W | 1-3 |
| Challenger Series TT | 2023/04/03 12:30 | Dennis Klein v Sven Happek | W | 3-1 |
| Challenger Series TT | 2023/03/06 19:30 | Sven Happek v Dennis Klein | W | 1-3 |
| Challenger Series TT | 2023/01/23 07:30 | Sven Happek v Dennis Klein | W | 1-3 |
| Challenger Series TT | 2023/01/09 14:10 | Sven Happek v Dennis Klein | W | 0-3 |
| Challenger Series TT | 2022/07/12 08:30 | Sven Happek v Dennis Klein | W | 1-3 |
| Challenger Ochsenhausen | 2022/06/23 06:30 | Dennis Klein v Sven Happek | W | 3-0 |
| Challenger Series TT | 2023/06/22 12:30 | Dennis Klein v Johannes Willeke | W | 3-0 |
| Challenger Series TT | 2023/06/22 09:10 | Tobias Slanina v Dennis Klein | W | 2-3 |
| Challenger Series TT | 2023/06/22 07:10 | Dennis Klein v Samuel Amann | W | 3-0 |
| Challenger Series TT | 2023/06/20 13:30 | Dennis Klein v Carlo Rossi | W | 3-1 |
| Challenger Series TT | 2023/06/20 11:25 | Dennis Klein v Jose Guillot | W | 3-0 |
| Challenger Series TT | 2023/06/20 09:50 | Dennis Klein v Jose Guillot | W | 3-0 |
| Challenger Series TT | 2023/06/20 06:30 | Dennis Klein v Carlo Rossi | L | 0-3 |
| Challenger Series TT | 2023/06/19 17:50 | Dennis Klein v Akito Itagaki | W | 3-0 |
| Challenger Series TT | 2023/06/22 11:50 | Tobias Slanina v Sven Happek | L | 3-2 |
| Challenger Series TT | 2023/06/22 09:50 | Sven Happek v Samuel Amann | W | 3-0 |
| Challenger Series TT | 2023/06/22 07:50 | Sven Happek v Ihor Zavadskyi | L | 1-3 |
| Challenger Series TT | 2023/06/20 12:50 | Jose Guillot v Sven Happek | L | 3-1 |
| Challenger Series TT | 2023/06/20 12:05 | Carlo Rossi v Sven Happek | L | 3-1 |
| Challenger Series TT | 2023/06/20 10:30 | Sven Happek v Carlo Rossi | W | 3-1 |
| Challenger Series TT | 2023/06/20 07:50 | Sven Happek v Akito Itagaki | W | 3-0 |
| Challenger Series TT | 2023/06/19 19:10 | Sven Happek v Aljaz Godec | W | 3-2 |