Estadio: Ochsenhausen, Germany
| Challenger Series TT | 2023/06/19 12:30 | Sven Happek v Johannes Willeke | W | 3-1 |
| Challenger Series TT | 2023/06/19 09:10 | Dennis Klein v Sven Happek | L | 3-1 |
| Challenger Series TT | 2023/06/19 07:10 | Sven Happek v Jose Guillot | L | 1-3 |
| Challenger Series TT | 2023/06/15 09:10 | Norbert Tauler v Sven Happek | L | 3-1 |
| Challenger Series TT | 2023/06/15 07:10 | Sven Happek v Liang Qiu | L | 2-3 |
| Challenger Series TT | 2023/05/23 09:10 | Sven Happek v Albert Vilardell | L | 1-3 |
| Challenger Series TT | 2023/05/22 19:50 | Sven Happek v Aljaz Godec | L | 0-3 |
| Challenger Series TT | 2023/05/22 17:10 | Sven Happek v Kirill Fadeev | L | 1-3 |
| Challenger Series TT | 2023/06/19 11:50 | Dennis Klein v Marco Stefanidis | L | 3-0 |
| 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 |