| 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 | |
| Challenger Series TT | 06/09 09:30 | - | Karl Zimmermann v Andrii Ostrovskyi | L | 0-3 | |
| Challenger Series TT | 06/09 09:30 | - | Karl Zimmermann v Bennet Robben | - | CANC | |
| Challenger Series TT | 06/09 08:00 | - | Karl Zimmermann v Pylyp Koloidenko | L | 2-3 | |
| Challenger Series TT | 03/28 11:30 | 50 | Kapric/Krainik v Karl Zimmermann | L | 3-2 | |
| Challenger Series TT | 03/28 10:45 | 2 | Mike Hollo v Karl Zimmermann | L | 3-1 | |
| Challenger Series TT | 03/28 09:30 | - | Karl Zimmermann v Tom Colvin | W | 3-2 | |
| Challenger Series TT | 03/28 07:30 | - | Karl Zimmermann v Samuel Cabanel | W | 3-0 |