| Dutch Open (GP) 2017, Qualification | 2023/10/11 14:00 | Koppen, Dennis v 루세브, 이반 | W | 2-1 |
| Bonn Int. Qual | 2023/05/31 17:20 | James Robertson v Koppen, Dennis | W | 0-2 |
| Bonn Int. Qual | 2023/05/31 09:45 | David Silva v Koppen, Dennis | W | 0-2 |
| Luxembourg Open Qual | 2023/05/04 14:50 | Simon Baron-Vezilier v Koppen, Dennis | L | 2-0 |
| Luxembourg Open Qual | 2023/05/04 12:15 | Kian-Yu Oei v Koppen, Dennis | W | 0-2 |
| Luxembourg Open Qual | 2023/05/04 08:00 | 올슨, 루드비히 페트레 v Koppen, Dennis | W | 0-2 |
| Dutch Int. | 2023/04/14 10:20 | 코에니그, 조엘 v Koppen, Dennis | L | 2-0 |
| Dutch Int. Qual | 2023/04/13 20:00 | Ze Xi Sean Ngu v Koppen, Dennis | W | 0-2 |
| Dutch Open (GP) 2017, Qualification | 2023/10/11 15:30 | Karl Sufryd v 바크맨, 케빈 | W | 2-1 |
| Dutch Open (GP) 2017, Qualification | 2023/10/11 12:35 | Mats Duwel v Karl Sufryd | W | 1-2 |