Round: 44 Ground: Clay
| ITF Portugal F3 Qual | 2017/03/11 09:30 | Marson, Guido v Dermiens, Guillaume | 6-2,6-3 |
| ITF Portugal F2 | 2017/03/05 16:30 | Hodor, Samuel v Dermiens, Guillaume | 6-2,6-4 |
| ITF Portugal F1 | 2017/02/25 09:30 | Dermiens, Guillaume v von Hafe Perez, Jose | 6-7,2-6 |
| ITF Belgium F4 Qual | 2016/07/02 07:00 | Andres, Mark-Flavius v Dermiens, Guillaume | 7-5,7-6 |
| ITF Belgium F2 Qual | 2016/06/19 12:50 | Maxence Beauge v Dermiens, Guillaume | 6-0,7-6 |
| ITF Portugal F2 | 2017/03/04 09:30 | Valentin De Carvalho v Rodrigues, Pedro Gabriel | 4-6,3-6 |