Results
| Challenger Series TT | 01/23 07:30 | - | Andrii Ostrovskyi v Karl Zimmermann | L | 3-0 | |
| Challenger Series TT | 01/22 17:30 | - | Marius Henninger v Karl Zimmermann | W | 2-3 | |
| Challenger Series TT | 01/22 16:00 | - | Akos Kishegyi v Karl Zimmermann | W | 2-3 | |
| Challenger Series TT | 01/22 14:30 | - | Karl Zimmermann v Divyansh Srivastava | L | 0-3 | |
| Challenger Series TT | 01/22 12:30 | - | Karl Zimmermann v Marco Stefanidis | L | 0-3 | |
| Challenger Series TT | 01/22 11:00 | - | Karl Zimmermann v Carlos Roman | W | 3-1 | |
| Challenger Series TT | 01/22 09:00 | - | Damian Zech v Karl Zimmermann | W | 2-3 | |
| Challenger Series TT | 06/10 07:30 | - |
Rafael Turrini
v
Karl Zimmermann |
- | CANC | |
| Challenger Series TT | 06/09 17:30 | - | Karl Zimmermann v Enio Mendes | - | CANC | |
| Challenger Series TT | 06/09 16:00 | - | Karl Walter v Karl Zimmermann | L | 3-1 | |
| Challenger Series TT | 06/09 14:00 | - | Olav Kosolosky v Karl Zimmermann | L | 3-1 | |
| Challenger Series TT | 06/09 12:00 | - | Karl Zimmermann v Johannes Willeke | W | 3-0 |
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