| Challenger Series TT | 2022/10/03 06:30 | Dennis Klein v Kenan Hrnic | W | 3-0 |
| Challenger Series TT | 2022/07/29 07:10 | Kenan Hrnic v Dennis Klein | W | 0-3 |
| Challenger Ochsenhausen | 2022/05/26 06:30 | Dennis Klein v Kenan Hrnic | W | 3-0 |
| Challenger Ochsenhausen | 2021/12/13 10:10 | Kenan Hrnic v Dennis Klein | W | 1-3 |
| 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 | 2023/01/10 07:30 | Yannick Vostes v Dennis Klein | L | 3-2 |
| Challenger Series TT | 2023/01/09 19:30 | Dennis Klein v Jean Rassouw | W | 3-0 |
| Challenger Series TT | 2023/02/02 08:10 | Kenan Hrnic v Anton Limonov | L | 0-3 |
| Challenger Series TT | 2023/01/17 08:50 | Andrei Putuntica v Kenan Hrnic | L | 3-0 |
| Challenger Series TT | 2023/01/17 08:10 | Amirreza Abbasi v Kenan Hrnic | L | 3-0 |
| Challenger Series TT | 2023/01/16 15:30 | Dauud Cheaib v Kenan Hrnic | L | 3-0 |
| Challenger Series TT | 2023/01/16 14:10 | Yannick Vostes v Kenan Hrnic | L | 3-2 |
| Challenger Series TT | 2023/01/16 12:10 | Florian Bluhm v Kenan Hrnic | L | 3-0 |
| Challenger Series TT | 2023/01/16 07:30 | Julian Mohr v Kenan Hrnic | L | 3-1 |
| Challenger Series TT | 2022/12/13 10:50 | Makoto Nogami v Kenan Hrnic | L | 3-0 |