| Challenger Ochsenhausen | 2022/05/12 12:30 | Dennis Klein v Sven Happek | W | 3-0 |
| Challenger Ochsenhausen | 2021/12/13 21:00 | Dennis Klein v Sven Happek | W | 3-0 |
| Challenger Ochsenhausen | 2021/12/01 12:50 | Sven Happek v Dennis Klein | W | 0-3 |
| Challenger Ochsenhausen | 2021/07/14 06:30 | Sven Happek v Dennis Klein | L | 3-2 |
| Challenger Ochsenhausen | 2021/02/24 12:50 | Sven Happek v Dennis Klein | W | 0-3 |
| Challenger Ochsenhausen | 2021/01/29 10:50 | Sven Happek v Dennis Klein | W | 0-3 |
| Challenger Ochsenhausen | 2022/06/20 13:10 | Mohammadali Rouintanesfahani v Dennis Klein | W | 2-3 |
| Challenger Ochsenhausen | 2022/06/20 10:30 | Simon Berglund v Dennis Klein | W | 1-3 |
| Challenger Ochsenhausen | 2022/06/20 07:50 | Damian Zech v Dennis Klein | W | 0-3 |
| Challenger Series TT | 2022/06/17 12:50 | Dennis Klein v Amirreza Abbasi | L | 2-3 |
| Challenger Series TT | 2022/06/17 10:45 | Simon Berglund v Dennis Klein | W | 1-3 |
| Challenger Series TT | 2022/06/17 08:30 | Mohammadali Rouintanesfahani v Dennis Klein | W | 0-3 |
| Challenger Series TT | 2022/06/17 07:10 | Amirreza Abbasi v Dennis Klein | W | 1-3 |
| Challenger Series TT | 2022/06/16 17:10 | Sudhanshu Grover v Dennis Klein | L | 3-2 |
| Challenger Ochsenhausen | 2022/06/20 12:30 | Florian Bluhm v Sven Happek | L | 3-1 |
| Challenger Ochsenhausen | 2022/06/20 11:10 | Mohammadali Rouintanesfahani v Sven Happek | L | 3-1 |
| Challenger Ochsenhausen | 2022/06/20 06:30 | Felix Wetzel v Sven Happek | L | 3-0 |
| Challenger Ochsenhausen | 2022/05/31 09:10 | Sven Happek v Carlo Rossi | L | 0-3 |
| Challenger Ochsenhausen | 2022/05/30 19:50 | Sven Happek v Maciej Kubik | L | 1-3 |
| Challenger Ochsenhausen | 2022/05/30 17:10 | Sven Happek v Eusebio Vos | W | 3-1 |
| Challenger Ochsenhausen | 2022/05/30 14:30 | Michael Engelhardt v Sven Happek | W | 2-3 |
| Challenger Ochsenhausen | 2022/05/30 11:50 | Albert Vilardell v Sven Happek | L | 3-2 |