| Luxembourg Open Qual | 2023/05/04 12:50 | Kai Niederhuber v Bruno Carvalho | L | 0-2 |
| Luxembourg Open Qual | 2023/05/04 10:30 | Ramnish Kumar v Kai Niederhuber | W | 0-2 |
| Polish Open Qual | 2023/03/22 16:00 | Matthias Kicklitz v Kai Niederhuber | L | 2-0 |
| Polish Open Qual | 2023/03/22 08:00 | Daniel Dvorak v Kai Niederhuber | W | 0-2 |
| Slovenia Future Series Qual | 2022/11/24 12:40 | Kai Niederhuber v Paul Tournefier | L | 0-2 |
| Hungarian Int. | 2022/11/03 13:20 | Chun-Yi Lin v Kai Niederhuber | L | 2-0 |
| Hungarian Int. Qual | 2022/11/03 08:35 | Sebastian Lassen Nielsen v Kai Niederhuber | W | 0-2 |
| Hungarian Int. Qual | 2022/11/02 19:05 | Kai Niederhuber v Nicolai Condratiuc | W | 2-0 |
| Dutch Int. Qual | 2023/04/13 09:50 | Adarsh Palani Kumar v Lukasz Cimosz | L | 1-2 |
| Portugal Int. Qual | 2023/03/08 17:00 | Neil Bhabuta v Adarsh Palani Kumar | L | 2-0 |
| Welsh Int. Qual | 2022/11/30 10:00 | Adarsh Palani Kumar v Joakim Oldorff | L | 0-2 |
| Welsh Int. Qual | 2022/11/29 12:30 | Adarsh Palani Kumar v Harper Leigh | W | 2-1 |