| Challenger Series TT | 2023/01/12 10:10 | Damian Zech v Sven Happek | W | 1-3 |
| Challenger Series TT | 2022/12/05 15:30 | Damian Zech v Sven Happek | L | 3-2 |
| Challenger Series TT | 2022/12/01 08:50 | Sven Happek v Damian Zech | W | 3-0 |
| Challenger Series TT | 2022/09/19 19:50 | Damian Zech v Sven Happek | W | 0-3 |
| Challenger Ochsenhausen | 2022/06/27 13:50 | Sven Happek v Damian Zech | W | 3-1 |
| Challenger Ochsenhausen | 2022/06/20 17:10 | Damian Zech v Sven Happek | W | 2-3 |
| Challenger Ochsenhausen | 2022/01/20 18:10 | Sven Happek v Damian Zech | L | 2-3 |
| Challenger Ochsenhausen | 2021/12/13 15:40 | Sven Happek v Damian Zech | W | 3-0 |
| Challenger Series TT | 2023/03/07 11:30 | Rodrigo Hidalgo v Sven Happek | L | 3-1 |
| Challenger Series TT | 2023/03/07 07:30 | Aljaz Godec v Sven Happek | W | 0-3 |
| Challenger Series TT | 2023/03/06 19:30 | Sven Happek v Dennis Klein | L | 1-3 |
| Challenger Series TT | 2023/03/06 16:10 | Sven Happek v Peter Hribar | L | 1-3 |
| Challenger Series TT | 2023/03/06 14:10 | Dauud Cheaib v Sven Happek | L | 3-0 |
| Challenger Series TT | 2023/03/06 11:30 | Bastien Dupont v Sven Happek | L | 3-1 |
| Challenger Series TT | 2023/03/06 08:50 | Marius Henninger v Sven Happek | L | 3-0 |
| Challenger Series TT | 2023/02/28 10:50 | Sven Happek v Remy Pham | W | 3-0 |
| Challenger Series TT | 2023/03/10 10:10 | Damian Zech v Thibault Poret | L | 0-3 |
| Challenger Series TT | 2023/03/09 20:50 | Damian Zech v Guilherme Teodoro | L | 0-3 |
| Challenger Series TT | 2023/03/09 18:10 | Damian Zech v Samuel Amann | W | 3-2 |
| Challenger Series TT | 2023/03/09 15:30 | Karl Zimmermann v Damian Zech | L | 3-0 |
| Challenger Series TT | 2023/03/09 12:50 | Kirill Fadeev v Damian Zech | L | 3-0 |
| Challenger Series TT | 2023/03/09 10:50 | Damian Zech v Dimitrije Levajac | L | 0-3 |
| Challenger Series TT | 2023/03/09 08:50 | Damian Zech v Dillon Chambers | L | 1-3 |
| Challenger Series TT | 2023/03/03 09:30 | Marco Stefanidis v Damian Zech | W | 1-3 |