Stadium: Ochsenhausen, Germany
| Challenger Series TT | 2023/06/08 08:30 | Antonin Gavlas v Akito Itagaki | L | 3-0 |
| Challenger Series TT | 2023/06/06 09:10 | Akito Itagaki v Simon Berglund | L | 0-3 |
| Challenger Series TT | 2023/06/05 19:50 | Akito Itagaki v Antonin Gavlas | L | 0-3 |
| Challenger Series TT | 2023/06/05 17:10 | Akito Itagaki v David Molnar | W | 3-2 |
| Challenger Series TT | 2023/06/05 14:30 | Kirill Fadeev v Akito Itagaki | L | 3-1 |
| Challenger Series TT | 2023/06/05 11:50 | Akos Kishegyi v Akito Itagaki | W | 1-3 |
| Challenger Series TT | 2023/06/05 09:50 | Akito Itagaki v Florian Bluhm | L | 0-3 |
| Challenger Series TT | 2023/06/05 07:50 | Akito Itagaki v Jin Ueda | L | 0-3 |
| Challenger Series TT | 2023/06/08 06:30 | Max Klink v Marco Stefanidis | W | 1-3 |
| Challenger Series TT | 2023/03/03 10:50 | Liang Qiu v Marco Stefanidis | L | 3-0 |
| Challenger Series TT | 2023/03/03 09:30 | Marco Stefanidis v Damian Zech | L | 1-3 |
| Challenger Series TT | 2023/03/02 19:30 | Guilherme Teodoro v Marco Stefanidis | L | 3-0 |
| Challenger Series TT | 2023/03/02 16:50 | Anton Limonov v Marco Stefanidis | L | 3-1 |
| Challenger Series TT | 2023/03/02 14:50 | Dillon Chambers v Marco Stefanidis | L | 3-0 |
| Challenger Series TT | 2023/03/02 10:50 | Albert Vilardell v Marco Stefanidis | L | 3-1 |
| Challenger Series TT | 2023/03/02 08:10 | Samuel Amann v Marco Stefanidis | W | 1-3 |