| Lithuanian Int. | 06/08 14:20 | - | Koppen, Dennis v 바로니, 엔리코 | L | 1-2 | |
| Lithuanian Int. | 06/08 07:00 | - | Koppen, Dennis v 소넨슈인, 아론 | W | 2-0 | |
| Lithuanian Int. | 06/07 12:00 | - | Dominik Kwinta v Koppen, Dennis | W | 0-2 | |
| Lithuanian Int. Quals | 06/07 06:50 | - | Koppen, Dennis v Hald, Soeren | - | Retired | |
| Lithuanian Int. Quals | 06/06 15:00 | - | 에켄그렌, 숀 v Koppen, Dennis | W | 0-2 | |
| Lithuanian Int. Quals | 06/06 12:25 | - | Bartosz Krajewski v Koppen, Dennis | W | 0-2 | |
| Bonn Int. Qual | 05/29 13:00 | - | Koppen, Dennis v Arthur Wakhevitsch | L | 0-2 | |
| Bonn Int. Qual | 05/29 10:00 | - | Thabani Mathe v Koppen, Dennis | - | Walkover | |
| Luxembourg Open Qual | 05/02 16:25 | - | Koppen, Dennis v 홈, 디틀레프 예거 | L | 0-2 | |
| Luxembourg Open Qual | 05/02 13:30 | - | 코, 지아 웨이 조엘 v Koppen, Dennis | W | 1-2 | |
| Dutch Int. Qual | 03/14 09:00 | - | Ngan, Heng Lin v Koppen, Dennis | - | View | |
| Spanish Int. | 11/14 16:20 | - | Jakob Houe v Koppen, Dennis | L | 2-1 | |
| Czech Open | 10/20 08:20 | - | 그네에트, 볼프강 v Koppen, Dennis | L | 2-0 | |
| Dutch Open (GP) 2016 | 10/13 14:25 | - | Koppen, Dennis v 드와카효, 에이드 레스키 | L | 0-2 | |
| Dutch Open (GP) 2016 | 10/12 13:55 | - | Koppen, Dennis v Sanjeevi Vasudevan | W | 2-1 | |
| Dutch Open (GP) 2017, Qualification | 10/11 17:50 | - | Koppen, Dennis v Karl Sufryd | W | 2-0 | |
| Dutch Open (GP) 2017, Qualification | 10/11 14:00 | - | Koppen, Dennis v 루세브, 이반 | W | 2-1 | |
| Dutch Open (GP) 2017, Qualification | 10/11 12:20 | - | Koppen, Dennis v 로즈, 이선 | - | Walkover | |
| Bonn Int. Qual | 06/01 07:00 | - | Kim Kristensen, D. v Koppen, Dennis | - | View | |
| Bonn Int. Qual | 05/31 17:20 | - | James Robertson v Koppen, Dennis | W | 0-2 | |
| Bonn Int. Qual | 05/31 09:45 | - | David Silva v Koppen, Dennis | W | 0-2 | |
| Luxembourg Open Qual | 05/04 14:50 | - | Simon Baron-Vezilier v Koppen, Dennis | L | 2-0 | |
| Luxembourg Open Qual | 05/04 12:15 | - | Kian-Yu Oei v Koppen, Dennis | W | 0-2 | |
| Luxembourg Open Qual | 05/04 08:00 | - | 올슨, 루드비히 페트레 v Koppen, Dennis | W | 0-2 | |
| Dutch Int. | 04/14 10:20 | - | 코에니그, 조엘 v Koppen, Dennis | L | 2-0 | |
| Dutch Int. Qual | 04/13 20:00 | - | Ze Xi Sean Ngu v Koppen, Dennis | W | 0-2 | |
| Dutch Int. Qual | 04/13 14:05 | - | Koppen, Dennis v Zack Bobrowski | W | 2-0 | |
| Dutch Int. Qual | 04/13 08:20 | - | 에리슨, 키스 마크 v Koppen, Dennis | W | 0-2 | |
| Slovenia Future Series | 11/25 15:20 | - | 다니엘락, 마테우스 v Koppen, Dennis | L | 2-1 | |
| Hungarian Int. Qual | 11/02 12:00 | - | Kayan, Cholan v Koppen, Dennis | L | 2-0 |