| Challenger Series TT | 2023/06/19 11:50 | Dennis Klein v Marco Stefanidis | L | 3-0 |
| Challenger Series TT | 2023/02/09 13:30 | Marco Stefanidis v Dennis Klein | L | 1-3 |
| Challenger Series TT | 2023/08/15 08:30 | Marcel Neumaier v Marco Stefanidis | W | 1-3 |
| Challenger Series TT | 2023/08/14 17:10 | Makoto Nogami v Marco Stefanidis | W | 1-3 |
| Challenger Series TT | 2023/08/14 15:10 | Dauud Cheaib v Marco Stefanidis | L | 3-2 |
| Challenger Series TT | 2023/08/14 13:50 | Carlos Caballero v Marco Stefanidis | L | 3-0 |
| Challenger Series TT | 2023/08/14 09:50 | Samuel Amann v Marco Stefanidis | W | 0-3 |
| Challenger Series TT | 2023/08/14 07:10 | Daniel Rinderer v Marco Stefanidis | L | 3-0 |
| Challenger Series TT | 2023/08/04 09:10 | Marco Stefanidis v Bohdan Sinkevych | L | 1-3 |
| Challenger Series TT | 2023/08/03 19:50 | Marco Stefanidis v Anton Limonov | L | 0-3 |
| Challenger Series TT | 2023/07/27 09:50 | Dennis Klein v Antonin Gavlas | L | 0-3 |
| Challenger Series TT | 2023/07/27 07:50 | Dennis Klein v Guillaume Alcayde | W | 3-1 |
| Challenger Series TT | 2023/07/11 13:30 | Dennis Klein v Benjamin Fruchart | W | 3-0 |
| Challenger Series TT | 2023/07/11 11:25 | Dennis Klein v Akos Kishegyi | W | 3-0 |
| Challenger Series TT | 2023/07/11 09:10 | Dennis Klein v Armin Alicic | W | 3-1 |
| Challenger Series TT | 2023/07/10 19:50 | Dennis Klein v Kestutis Zeimys | W | 3-0 |
| Challenger Series TT | 2023/07/10 17:10 | Dennis Klein v Samuel Amann | W | 3-0 |
| Challenger Series TT | 2023/07/10 14:30 | Damian Zech v Dennis Klein | W | 0-3 |