| Challenger Series TT | 2022/12/13 09:30 | Kenan Hrnic v Karl Zimmermann | W | 1-3 |
| Challenger Series TT | 2022/12/13 08:10 | Sven Happek v Karl Zimmermann | W | 1-3 |
| Challenger Series TT | 2022/12/12 18:10 | Nikola Grujic v Karl Zimmermann | W | 1-3 |
| Challenger Series TT | 2022/12/12 16:10 | Marius Henninger v Karl Zimmermann | L | 3-2 |
| Challenger Series TT | 2022/12/12 13:30 | Jeromy Loffler v Karl Zimmermann | L | 3-1 |
| Challenger Series TT | 2022/12/12 12:10 | Anton Limonov v Karl Zimmermann | L | 3-0 |
| Challenger Series TT | 2022/12/12 07:30 | Makoto Nogami v Karl Zimmermann | L | 3-2 |
| Challenger Series TT | 2022/11/11 11:30 | Karl Zimmermann v Ronit Bhanja | L | 1-3 |
| Challenger Series TT | 2022/12/06 08:50 | Damian Zech v Salim Karam | L | 3-0 |
| Challenger Series TT | 2022/12/05 20:50 | Sven Happek v Salim Karam | L | 3-1 |
| Challenger Series TT | 2022/12/05 18:50 | Florian Bluhm v Salim Karam | L | 3-0 |
| Challenger Series TT | 2022/12/05 16:50 | Salim Karam v Dauud Cheaib | L | 0-3 |
| Challenger Series TT | 2022/12/05 14:10 | Salim Karam v Elia Schmid | L | 0-3 |
| Challenger Series TT | 2022/12/05 12:10 | Salim Karam v Amirreza Abbasi | L | 0-3 |
| Challenger Series TT | 2022/12/05 09:30 | John Oyebode v Salim Karam | L | 3-2 |
| WTT Feeder Dusseldorf | 2022/11/22 10:55 | Salim Karam v Mahmoud Helmy | L | 0-1 |