Stadium: Ochsenhausen, Germany
| Challenger Series TT | 2023/12/19 09:30 | Akito Itagaki v Dennis Klein | L | 0-3 |
| 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 |