| Challenger Series TT | 2023/02/02 12:50 | Dennis Klein v Damian Zech | W | 3-0 |
| Challenger Series TT | 2023/02/02 10:10 | Dennis Klein v Kenan Hrnic | W | 3-0 |
| Challenger Series TT | 2023/02/02 07:30 | Dennis Klein v Kirill Fadeev | W | 3-1 |
| Challenger Series TT | 2023/01/23 12:10 | Enzo Angles v Dennis Klein | L | 3-1 |
| Challenger Series TT | 2023/01/23 07:30 | Sven Happek v Dennis Klein | W | 1-3 |
| Challenger Series TT | 2023/01/10 13:50 | Dennis Klein v Yannick Vostes | W | 3-0 |
| Challenger Series TT | 2023/01/10 12:25 | Yongyin Li v Dennis Klein | L | 3-0 |
| Challenger Series TT | 2023/01/10 11:30 | Yongyin Li v Dennis Klein | L | 3-0 |
| Challenger Series TT | 2023/02/02 14:50 | Hannes Hormann v Anton Limonov | L | 1-3 |
| Challenger Series TT | 2023/02/02 11:30 | Hannes Hormann v Dillon Chambers | L | 1-3 |
| Challenger Series TT | 2023/02/02 09:30 | Hannes Hormann v Nikola Grujic | L | 2-3 |