Estadio: Ochsenhausen, Germany
| Challenger Series TT | 2023/06/22 14:30 | Dennis Klein v Sven Happek | W | 3-0 |
| 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 Series TT | 2023/10/17 12:50 | Simon Berglund v Dennis Klein | W | 2-3 |
| Challenger Series TT | 2023/10/17 11:25 | Dauud Cheaib v Dennis Klein | W | 2-3 |
| Challenger Series TT | 2023/10/17 09:10 | Dennis Klein v Simon Berglund | L | 0-3 |
| Challenger Series TT | 2023/10/17 06:30 | Dennis Klein v Jong-Eon Yeon | W | 3-0 |
| Challenger Series TT | 2023/10/16 17:50 | Dennis Klein v Stephane Ouaiche | L | 1-3 |
| Challenger Series TT | 2023/10/16 16:30 | Dennis Klein v Carlos Caballero | W | 3-1 |
| Challenger Series TT | 2023/10/16 11:50 | Dennis Klein v Akito Itagaki | W | 3-0 |
| Challenger Series TT | 2023/10/16 09:10 | Dennis Klein v Dauud Cheaib | L | 2-3 |
| Challenger Series TT | 2023/10/10 09:10 | Sven Happek v Armin Alicic | L | 0-3 |
| Challenger Series TT | 2023/10/09 19:50 | Sven Happek v Admir Duranspahic | L | 0-3 |
| Challenger Series TT | 2023/10/09 17:10 | Sven Happek v Dauud Cheaib | L | 0-3 |
| Challenger Series TT | 2023/10/09 14:30 | Mike Hollo v Sven Happek | L | 3-1 |
| Challenger Series TT | 2023/10/09 11:50 | Liang Qiu v Sven Happek | L | 3-0 |
| Challenger Series TT | 2023/10/09 09:50 | Sven Happek v Alexander Valuch | L | 0-3 |
| Challenger Series TT | 2023/10/09 07:50 | Sven Happek v Rafael Turrini | L | 0-3 |
| Challenger Series TT | 2023/10/06 10:30 | Sven Happek v Guillaume Alcayde | L | 1-3 |