Estadio: Ochsenhausen, Germany
| 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 de Ochsenhausen | 2022/06/23 06:30 | Dennis Klein v Sven Happek | L | 3-0 |
| Challenger de Ochsenhausen | 2022/06/20 15:10 | Dennis Klein v Sven Happek | L | 3-1 |
| Challenger de Ochsenhausen | 2022/05/12 12:30 | Dennis Klein v Sven Happek | L | 3-0 |
| Challenger de Ochsenhausen | 2021/12/13 21:00 | Dennis Klein v Sven Happek | L | 3-0 |
| Challenger de Ochsenhausen | 2021/12/01 12:50 | Sven Happek v Dennis Klein | L | 0-3 |
| Challenger Series TT | 2023/03/06 16:10 | Sven Happek v Peter Hribar | L | 1-3 |
| Challenger Series TT | 2023/03/06 14:10 | Dauud Cheaib v Sven Happek | L | 3-0 |
| Challenger Series TT | 2023/03/06 11:30 | Bastien Dupont v Sven Happek | L | 3-1 |
| Challenger Series TT | 2023/03/06 08:50 | Marius Henninger v Sven Happek | L | 3-0 |
| Challenger Series TT | 2023/02/28 10:50 | Sven Happek v Remy Pham | W | 3-0 |
| Challenger Series TT | 2023/02/28 07:30 | Sven Happek v Emiliano Riofrio | L | 2-3 |
| Challenger Series TT | 2023/02/27 18:50 | Sven Happek v Alvaro Gainza | W | 3-1 |
| Challenger Series TT | 2023/02/27 17:30 | Sven Happek v Dillon Chambers | W | 3-2 |
| Challenger Series TT | 2023/03/06 16:50 | Dauud Cheaib v Dennis Klein | W | 0-3 |
| Challenger Series TT | 2023/03/06 14:50 | Bastien Dupont v Dennis Klein | W | 0-3 |
| Challenger Series TT | 2023/03/06 10:50 | Marius Henninger v Dennis Klein | W | 0-3 |
| Challenger Series TT | 2023/03/06 08:10 | Rodrigo Hidalgo v Dennis Klein | W | 1-3 |
| Challenger Series TT | 2023/02/10 14:30 | Dennis Klein v Andrei Putuntica | W | 3-0 |
| Challenger Series TT | 2023/02/10 12:25 | Dennis Klein v Sourav Saha | W | 3-1 |
| Challenger Series TT | 2023/02/10 09:30 | Bohdan Sinkevych v Dennis Klein | W | 1-3 |
| Challenger Series TT | 2023/02/10 08:10 | Bastien Dupont v Dennis Klein | W | 0-3 |