| Open du Luxembourg - Qualif. | 2023/05/04 08:40 | Kian-Yu Oei v Filip Karlborg | W | 2-0 |
| Dutch Int. - Qualif. | 2023/04/13 11:30 | Kian-Yu Oei v Keisuke Fujiwara | L | 1-2 |
| Dutch Int. - Qualif. | 2023/04/13 07:40 | Kian-Yu Oei v Kuan-Chih Shih | W | 2-0 |
| Open de Pologne - Qualif. | 2023/03/22 08:35 | Kim Kristensen, D. v Kian-Yu Oei | L | 2-1 |
| Hungarian Int. | 2022/11/03 16:40 | Ivancic, Miha v Kian-Yu Oei | L | 2-0 |
| Hungarian Int. Qual | 2022/11/03 08:00 | Mateusz Danielak v Kian-Yu Oei | W | 1-2 |
| Hungarian Int. Qual | 2022/11/02 16:00 | Kian-Yu Oei v Krapez, Andraz | W | 2-0 |
| Hungarian Int. Qual | 2022/11/02 12:20 | Mathias Solgaard v Kian-Yu Oei | W | 0-2 |
| Open du Luxembourg - Qualif. | 2023/05/04 08:00 | Ludvig Petre Olsson v Dennis Koppen | W | 0-2 |
| Dutch Int. - | 2023/04/14 10:20 | Joel Koenig v Dennis Koppen | L | 2-0 |
| Dutch Int. - Qualif. | 2023/04/13 20:00 | Ze Xi Sean Ngu v Dennis Koppen | W | 0-2 |
| Dutch Int. - Qualif. | 2023/04/13 14:05 | Dennis Koppen v Zack Bobrowski | W | 2-0 |
| Dutch Int. - Qualif. | 2023/04/13 08:20 | Edison, Keith Mark v Dennis Koppen | W | 0-2 |
| Slovenia Future Series | 2022/11/25 15:20 | Mateusz Danielak v Dennis Koppen | L | 2-1 |
| Hungarian Int. Qual | 2022/11/02 12:00 | Cholan Kayan v Dennis Koppen | L | 2-0 |
| Dutch Open | 2022/10/13 08:35 | Burestedt, Felix v Dennis Koppen | L | 2-0 |