Stadium: Ochsenhausen, Germany
| Challenger Series TT | 2023/06/19 06:30 | Dennis Klein v Johannes Willeke | W | 3-0 |
| Challenger Series TT | 2023/06/22 09:10 | Tobias Slanina v Dennis Klein | W | 2-3 |
| Challenger Series TT | 2023/06/22 07:10 | Dennis Klein v Samuel Amann | W | 3-0 |
| Challenger Series TT | 2023/06/20 13:30 | Dennis Klein v Carlo Rossi | W | 3-1 |
| Challenger Series TT | 2023/06/20 11:25 | Dennis Klein v Jose Guillot | W | 3-0 |
| Challenger Series TT | 2023/06/20 09:50 | Dennis Klein v Jose Guillot | W | 3-0 |
| Challenger Series TT | 2023/06/20 06:30 | Dennis Klein v Carlo Rossi | L | 0-3 |
| Challenger Series TT | 2023/06/19 17:50 | Dennis Klein v Akito Itagaki | W | 3-0 |
| Challenger Series TT | 2023/06/19 16:30 | Dennis Klein v Aljaz Godec | W | 3-0 |
| Challenger Series TT | 2023/06/22 11:10 | Dauud Cheaib v Johannes Willeke | L | 3-0 |
| Challenger Series TT | 2023/06/22 06:30 | Tobias Slanina v Johannes Willeke | L | 3-2 |
| Challenger Series TT | 2023/06/20 08:30 | Jose Guillot v Johannes Willeke | L | 3-1 |
| Challenger Series TT | 2023/06/20 07:10 | Aljaz Godec v Johannes Willeke | L | 3-0 |
| Challenger Series TT | 2023/06/19 17:10 | Marco Stefanidis v Johannes Willeke | L | 3-0 |
| Challenger Series TT | 2023/06/19 15:10 | Carlo Rossi v Johannes Willeke | L | 3-0 |
| Challenger Series TT | 2023/06/19 12:30 | Sven Happek v Johannes Willeke | L | 3-1 |
| Challenger Series TT | 2023/06/19 11:10 | Akito Itagaki v Johannes Willeke | L | 3-1 |