| Polish Int. Qual | 2023/09/21 07:40 | Kai Niederhuber v Maksymilian Krogulski | W | 2-0 |
| Slovenia Future Series | 2023/09/08 08:45 | Jeppe Bruun Christensen v Kai Niederhuber | L | 2-1 |
| Bonn Int. Qual | 2023/05/31 09:10 | Kai Niederhuber v David K Kristensen | L | 0-2 |
| Austrian Open Qual | 2023/05/25 09:55 | Kai Niederhuber v Jia Jie Tan | L | 0-2 |
| Slovenia Open Quals | 2023/05/17 16:45 | Kai Niederhuber v Yaro Van Delsen | L | 1-2 |
| Slovenia Open Quals | 2023/05/17 09:10 | Kai Niederhuber v Adarsh Palani Kumar | W | 2-0 |
| 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 |
| Belgian Int. Qual | 2023/09/13 13:20 | Kai Hern Huan v Aaron Sonnenschein | L | 2-0 |
| Belgian Int. Qual | 2023/09/13 12:00 | Aaron Sonnenschein v Anosch Ali | W | 2-0 |
| Latvia Int. Qual | 2023/08/31 15:20 | Thomas Barth v Aaron Sonnenschein | W | 0-2 |
| Latvia Int. Qual | 2023/08/31 11:15 | Angus Meldrum v Aaron Sonnenschein | W | 0-2 |
| Lithuanian Int. Qual | 2023/06/08 15:30 | Remus NG v Aaron Sonnenschein | L | 2-1 |
| Lithuanian Int. Qual | 2023/06/08 11:40 | Matteo Justel v Aaron Sonnenschein | W | 1-2 |
| Bonn Int. | 2023/06/01 13:20 | Aaron Sonnenschein v Yohan Barbieri | L | 1-2 |
| Bonn Int. Qual | 2023/05/31 14:20 | Rui Yang Ryan Tan v Aaron Sonnenschein | W | 1-2 |