Stadium: Ochsenhausen, Germany
| Challenger Series TT | 2023/06/19 19:50 | Marco Stefanidis v Akito Itagaki | L | 1-3 |
| Challenger Series TT | 2023/06/08 11:10 | Akito Itagaki v Marco Stefanidis | W | 1-3 |
| Challenger Series TT | 2023/09/14 09:10 | Jin Ueda v Marco Stefanidis | L | 3-0 |
| Challenger Series TT | 2023/09/14 07:10 | Marco Stefanidis v Kirill Fadeev | L | 1-3 |
| Challenger Series TT | 2023/08/18 09:50 | Marco Stefanidis v Tobias Slanina | L | 2-3 |
| Challenger Series TT | 2023/08/18 06:30 | Marco Stefanidis v Makoto Nogami | L | 0-3 |
| Challenger Series TT | 2023/08/17 17:50 | Marco Stefanidis v Alvaro Gainza | W | 3-1 |
| Challenger Series TT | 2023/08/17 16:30 | Marco Stefanidis v Marius Henninger | L | 0-3 |
| Challenger Series TT | 2023/08/17 11:50 | Marco Stefanidis v Kirill Fadeev | L | 0-3 |
| Challenger Series TT | 2023/08/17 09:10 | Marco Stefanidis v Daniel Rinderer | L | 1-3 |
| Challenger Series TT | 2023/09/14 11:10 | Dauud Cheaib v Akito Itagaki | L | 3-1 |
| Challenger Series TT | 2023/09/14 06:30 | Jin Ueda v Akito Itagaki | L | 3-1 |
| Challenger Series TT | 2023/07/04 09:50 | Kirill Fadeev v Akito Itagaki | L | 3-0 |
| Challenger Series TT | 2023/07/04 08:30 | Akito Itagaki v Daniel Rinderer | L | 2-3 |
| Challenger Series TT | 2023/07/03 18:30 | David Reitspies v Akito Itagaki | L | 3-2 |
| Challenger Series TT | 2023/07/03 15:50 | Benjamin Fruchart v Akito Itagaki | L | 3-1 |
| Challenger Series TT | 2023/07/03 13:50 | Mathias Golab v Akito Itagaki | W | 1-3 |
| Challenger Series TT | 2023/07/03 09:50 | Dennis Klein v Akito Itagaki | L | 3-0 |