Round: 44 Ground: Clay
| ITF Belgium F4 | 2018/07/14 08:30 | Jakub Wojcik v Guillaume Dermiens | 6-1,6-2 |
| ITF Belgium F3 | 2018/07/03 08:00 | Guillaume Dermiens v Georgii Kravchenko | 3-6,3-6 |
| ITF Belgium F3 Qual | 2018/07/02 08:00 | Guillaume Dermiens v Luke Vandecasteele | 6-2,4-6,6-3 |
| ITF Belgium F3 Qual | 2018/07/01 08:00 | Guillaume Dermiens v Ian O'Jon | 6-2,6-2 |
| ITF Belgium F3 Qual | 2018/06/30 07:30 | Jeremy Sonkin v Guillaume Dermiens | 4-6,4-6 |
| ITF Netherlands F1 | 2018/06/26 10:35 | Mats Hermans v Guillaume Dermiens | 7-6,4-6,6-4 |
| ITF Netherlands F1 Qual | 2018/06/25 10:50 | Niels Lootsma v Guillaume Dermiens | 4-6,6-7 |
| ITF Netherlands F1 Qual | 2018/06/24 09:00 | Guillaume Dermiens v Aloys J W Van Baal | 6-2,6-2 |
| ITF Belgium F3 Qual | 2018/06/30 07:30 | Christopher Heyman v Joaquin P M Bannen | 6-1,6-1 |
| ITF Chile F3 | 2017/12/02 14:00 | Javier Naser v Joaquin P M Bannen | 6-3,6-0 |