Stadium: COURT 1 Round: 26 Ground: Clay
| ITF Belgium F6 | 2018/08/01 15:00 | Geens, Clement v Benjamin Pietri | 6-2,6-3 |
| ITF Belgium F3 | 2018/07/03 11:00 | Geens, Clement v Butler, Samm | 3-6,6-3,7-5 |
| ITF Netherlands F1 | 2018/07/01 13:00 | Geens, Clement v Botic Van De Zandschulp | 3-6,7-6,6-1 |
| ITF Netherlands F1 | 2018/06/30 13:25 | Geens, Clement v Gerritsen, Stephan | 7-5,6-4 |
| ITF Netherlands F1 | 2018/06/29 13:00 | Fransen, Stephan v Geens, Clement | 3-6,3-6 |
| ITF Netherlands F1 | 2018/06/28 15:40 | Gelhardt, Luca v Geens, Clement | 4-6,3-6 |
| ITF Netherlands F1 | 2018/06/26 15:10 | Michiel de Krom v Geens, Clement | 1-6,3-6 |
| ITF Belgium F1 | 2018/06/23 14:00 | Netuschil, Marvin v Geens, Clement | 7-6,6-1 |
| ITF Belgium F5 | 2018/07/25 12:10 | Pauwels, Maxime v Sinclair, Colin | 7-6,4-6,6-4 |
| ITF Belgium F5 | 2018/07/24 14:00 | Sinclair, Colin v Gabriel Donev | 6-3,6-4 |
| ITF Belgium F4 | 2018/07/18 12:55 | Sonkin, Jeremy v Sinclair, Colin | 7-6,7-5 |
| ITF Belgium F4 | 2018/07/17 13:10 | Sinclair, Colin v Zizou Bergs | 0-6,7-5,6-3 |
| ITF Netherlands F3 | 2018/07/07 09:30 | Sinclair, Colin v van Buuren, Ilco | 6-2,6-2 |
| ITF Netherlands F3 | 2018/07/07 08:00 | Sinclair, Colin v Meuffels, Alban | 2-6,4-6 |
| Coupe Davis | 2018/04/04 11:50 | Sinclair, Colin v Chin, Christian Didier | 3-6,2-6 |
| ITF Thailand F12 | 2017/12/12 10:00 | Sinclair, Colin v Daniel Altmaier | 3-6,5-7 |