| Challenger Series TT | 2022/07/12 08:30 | Sven Happek v Dennis Klein | L | 1-3 |
| Challenger Ochsenhausen | 2022/06/23 06:30 | Dennis Klein v Sven Happek | L | 3-0 |
| Challenger Ochsenhausen | 2022/06/20 15:10 | Dennis Klein v Sven Happek | L | 3-1 |
| Challenger Ochsenhausen | 2022/05/12 12:30 | Dennis Klein v Sven Happek | L | 3-0 |
| Challenger Ochsenhausen | 2021/12/13 21:00 | Dennis Klein v Sven Happek | L | 3-0 |
| Challenger Ochsenhausen | 2021/12/01 12:50 | Sven Happek v Dennis Klein | L | 0-3 |
| Challenger Ochsenhausen | 2021/07/14 06:30 | Sven Happek v Dennis Klein | W | 3-2 |
| Challenger Ochsenhausen | 2021/02/24 12:50 | Sven Happek v Dennis Klein | L | 0-3 |
| Challenger Series TT | 2023/01/09 12:10 | Sven Happek v Dauud Cheaib | L | 0-3 |
| Challenger Series TT | 2023/01/09 09:30 | Daniel Rinderer v Sven Happek | L | 3-2 |
| Challenger Series TT | 2022/12/20 11:30 | Pavol Mego v Sven Happek | L | 3-0 |
| Challenger Series TT | 2022/12/20 07:30 | Samuel Amann v Sven Happek | W | 1-3 |
| Challenger Series TT | 2022/12/19 19:30 | Sven Happek v Josip Huzjak | W | 3-2 |
| Challenger Series TT | 2022/12/19 16:10 | Sven Happek v Liang Qiu | W | 3-0 |
| Challenger Series TT | 2022/12/19 14:10 | Marko Panic v Sven Happek | L | 3-0 |
| Challenger Series TT | 2022/12/19 11:30 | Dauud Cheaib v Sven Happek | L | 3-1 |
| Challenger Series TT | 2023/01/09 11:30 | Daniel Rinderer v Dennis Klein | L | 3-2 |
| Challenger Series TT | 2023/01/09 08:50 | Kestutis Zeimys v Dennis Klein | W | 2-3 |
| Challenger Series TT | 2022/11/01 14:30 | Dennis Klein v Josip Huzjak | W | 3-1 |
| Challenger Series TT | 2022/11/01 12:25 | Dennis Klein v Mathias Hübgen | W | 3-1 |
| Challenger Series TT | 2022/11/01 09:30 | Mohammadali Rouintanesfahani v Dennis Klein | W | 0-3 |
| Challenger Series TT | 2022/11/01 08:10 | Arman Hajiei v Dennis Klein | W | 0-3 |
| Challenger Series TT | 2022/10/31 18:10 | Kirill Fadeev v Dennis Klein | W | 0-3 |
| Challenger Series TT | 2022/10/31 16:10 | Josip Huzjak v Dennis Klein | W | 2-3 |