| Dutch Open Qual | 2023/10/11 14:00 | Dennis Koppen v Ivan Rusev | W | 2-1 |
| Bonn Int. Qual | 2023/05/31 17:20 | James Robertson v Dennis Koppen | W | 0-2 |
| Bonn Int. Qual | 2023/05/31 09:45 | David Silva v Dennis Koppen | W | 0-2 |
| Luxembourg Open Qual | 2023/05/04 14:50 | Simon Baron-Vezilier v Dennis Koppen | L | 2-0 |
| Luxembourg Open Qual | 2023/05/04 12:15 | Kian-Yu Oei v Dennis Koppen | W | 0-2 |
| Luxembourg Open Qual | 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. Qual | 2023/04/13 20:00 | Ze Xi Sean Ngu v Dennis Koppen | W | 0-2 |
| Dutch Open Qual | 2023/10/11 15:30 | Karl Sufryd v Kevin Barkman | W | 2-1 |
| Dutch Open Qual | 2023/10/11 12:35 | Mats Duwel v Karl Sufryd | W | 1-2 |