Estadio: Ochsenhausen, Germany
| Challenger Series TT | 2023/11/13 12:50 | Dennis Klein v Akito Itagaki | L | 3-1 |
| Challenger Series TT | 2023/10/16 11:50 | Dennis Klein v Akito Itagaki | L | 3-0 |
| Challenger Series TT | 2023/07/03 09:50 | Dennis Klein v Akito Itagaki | L | 3-0 |
| Challenger Series TT | 2023/06/19 17:50 | Dennis Klein v Akito Itagaki | L | 3-0 |
| Challenger Series TT | 2023/05/04 19:50 | Dennis Klein v Akito Itagaki | L | 3-1 |
| Challenger Series TT | 2023/12/18 19:30 | Benjamin Fruchart v Akito Itagaki | L | 3-1 |
| Challenger Series TT | 2023/12/18 16:50 | Damien Llorca v Akito Itagaki | L | 3-0 |
| Challenger Series TT | 2023/12/18 14:50 | Adrien Coton v Akito Itagaki | L | 3-2 |
| Challenger Series TT | 2023/12/18 10:50 | Damian Zech v Akito Itagaki | W | 0-3 |
| Challenger Series TT | 2023/12/18 08:10 | Liang Qiu v Akito Itagaki | L | 3-1 |
| Challenger Series TT | 2023/12/05 10:50 | Carlo Rossi v Akito Itagaki | L | 3-0 |
| Challenger Series TT | 2023/12/05 09:30 | Akito Itagaki v Rafael Turrini | L | 0-3 |
| Challenger Series TT | 2023/12/04 19:30 | Corentin Mazaud v Akito Itagaki | L | 3-1 |
| Challenger Series TT | 2023/12/19 08:10 | Adrien Coton v Dennis Klein | W | 0-3 |
| Challenger Series TT | 2023/12/18 18:10 | Damian Zech v Dennis Klein | W | 0-3 |
| Challenger Series TT | 2023/12/18 16:10 | Benjamin Fruchart v Dennis Klein | L | 3-2 |
| Challenger Series TT | 2023/12/18 13:30 | Liang Qiu v Dennis Klein | L | 3-1 |
| Challenger Series TT | 2023/12/18 12:10 | Damien Llorca v Dennis Klein | L | 3-2 |
| Challenger Series TT | 2023/12/18 07:30 | Daniel Rinderer v Dennis Klein | W | 1-3 |
| Challenger Series TT | 2023/12/12 14:30 | Dennis Klein v Lichen Wang | L | 0-3 |
| Challenger Series TT | 2023/12/12 12:25 | Dennis Klein v Liang Qiu | W | 3-1 |