Stadium: Ochsenhausen, Germany
| Challenger Series TT | 2023/05/29 11:10 | Peter Hribar v Bohdan Sinkevych | W | 3-0 |
| Challenger Series TT | 2023/05/29 08:30 | Dauud Cheaib v Peter Hribar | W | 2-3 |
| Challenger Series TT | 2023/05/19 12:50 | Peter Hribar v Florian Bluhm | L | 2-3 |
| Challenger Series TT | 2023/05/19 11:25 | Antonin Gavlas v Peter Hribar | L | 3-2 |
| Challenger Series TT | 2023/05/19 09:10 | Marius Henninger v Peter Hribar | W | 0-3 |
| Challenger Series TT | 2023/05/19 07:10 | Peter Hribar v Pekka Pelz | L | 2-3 |
| Challenger Series TT | 2023/05/18 19:10 | Florian Bluhm v Peter Hribar | L | 3-1 |
| Challenger Series TT | 2023/05/18 16:30 | Liang Qiu v Peter Hribar | W | 1-3 |
| Challenger Series TT | 2023/05/29 10:30 | Dauud Cheaib v Karl Zimmermann | L | 3-0 |
| Challenger Series TT | 2023/05/29 07:50 | Carlo Rossi v Karl Zimmermann | L | 3-0 |
| Challenger Series TT | 2023/03/10 11:30 | Karl Zimmermann v Dillon Chambers | L | 1-3 |
| Challenger Series TT | 2023/03/10 08:50 | Karl Zimmermann v Guilherme Teodoro | L | 1-3 |
| Challenger Series TT | 2023/03/09 20:10 | Karl Zimmermann v Thibault Poret | L | 0-3 |
| Challenger Series TT | 2023/03/09 15:30 | Karl Zimmermann v Damian Zech | W | 3-0 |
| Challenger Series TT | 2023/03/09 13:30 | Karl Zimmermann v Samuel Amann | W | 3-0 |
| Challenger Series TT | 2023/03/09 10:10 | Kirill Fadeev v Karl Zimmermann | L | 3-1 |