| 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 Ochsenhausen | 2021/01/29 10:50 | Sven Happek v Dennis Klein | L | 0-3 |
| Challenger Series TT | 2022/07/11 18:30 | Amir Hossein Hodaei v Sven Happek | L | 3-2 |
| Challenger Series TT | 2022/07/11 15:50 | Michael Engelhardt v Sven Happek | W | 2-3 |
| Challenger Series TT | 2022/07/11 13:50 | Daniel Rinderer v Sven Happek | L | 3-0 |
| Challenger Series TT | 2022/07/11 09:50 | Felix Kleeberg v Sven Happek | W | 1-3 |
| Challenger Series TT | 2022/07/11 07:10 | Samuel Amann v Sven Happek | W | 1-3 |
| Challenger Series TT | 2022/07/05 08:30 | Dauud Cheaib v Sven Happek | L | 3-0 |
| Challenger Series TT | 2022/07/05 07:10 | Mohammadali Rouintanesfahani v Sven Happek | L | 3-0 |
| Challenger Series TT | 2022/07/04 17:10 | Josip Huzjak v Sven Happek | W | 0-3 |
| Challenger Series TT | 2022/07/12 07:10 | Daniel Rinderer v Dennis Klein | W | 1-3 |
| Challenger Series TT | 2022/07/11 17:10 | Felix Kleeberg v Dennis Klein | W | 0-3 |
| Challenger Series TT | 2022/07/11 15:10 | Amir Hossein Hodaei v Dennis Klein | W | 2-3 |
| Challenger Series TT | 2022/07/11 12:30 | Samuel Amann v Dennis Klein | W | 0-3 |
| Challenger Series TT | 2022/07/11 11:10 | Michael Engelhardt v Dennis Klein | W | 1-3 |
| Challenger Series TT | 2022/07/11 06:30 | Kirill Fadeev v Dennis Klein | W | 2-3 |
| Challenger Ochsenhausen | 2022/06/24 13:30 | Simon Berglund v Dennis Klein | L | 3-1 |
| Challenger Ochsenhausen | 2022/06/24 13:05 | Amirreza Abbasi v Dennis Klein | W | 1-3 |