Stadium: Ochsenhausen, Germany
| Challenger Series TT | 2023/02/09 13:30 | Marco Stefanidis v Dennis Klein | W | 1-3 |
| Challenger Series TT | 2023/06/19 09:10 | Dennis Klein v Sven Happek | W | 3-1 |
| Challenger Series TT | 2023/06/19 06:30 | Dennis Klein v Johannes Willeke | W | 3-0 |
| Challenger Series TT | 2023/05/09 12:50 | Humberto Manhani v Dennis Klein | W | 2-3 |
| Challenger Series TT | 2023/05/09 12:05 | Amirreza Abbasi v Dennis Klein | L | 3-1 |
| Challenger Series TT | 2023/05/09 08:30 | Amirreza Abbasi v Dennis Klein | W | 1-3 |
| Challenger Series TT | 2023/05/09 07:10 | Humberto Manhani v Dennis Klein | W | 2-3 |
| Challenger Series TT | 2023/05/08 17:10 | Sven Happek v Dennis Klein | W | 1-3 |
| Challenger Series TT | 2023/05/08 15:10 | Anton Limonov v Dennis Klein | W | 2-3 |
| Challenger Series TT | 2023/06/19 09:50 | Marco Stefanidis v Jose Guillot | L | 1-3 |
| Challenger Series TT | 2023/06/19 07:50 | Marco Stefanidis v Carlo Rossi | L | 1-3 |
| Challenger Series TT | 2023/06/09 08:30 | Kirill Fadeev v Marco Stefanidis | L | 3-0 |
| Challenger Series TT | 2023/06/09 07:10 | Antonin Gavlas v Marco Stefanidis | L | 3-0 |
| Challenger Series TT | 2023/06/08 17:10 | Tobias Slanina v Marco Stefanidis | L | 3-1 |
| Challenger Series TT | 2023/06/08 15:10 | Jeromy Loffler v Marco Stefanidis | L | 3-1 |
| Challenger Series TT | 2023/06/08 12:30 | Florian Bluhm v Marco Stefanidis | L | 3-2 |
| Challenger Series TT | 2023/06/08 11:10 | Akito Itagaki v Marco Stefanidis | W | 1-3 |