| ITF M25 Monastir | 02/14 08:00 | 62 | Butler, Samm v Dermiens, Guillaume | 6-0,7-5 | |
| ITF M25 Monastir | 02/13 08:00 | 62 | Jean-Christian Morandais v Dermiens, Guillaume | 1-6,7-6,6-10 | |
| ITF M25 Monastir | 02/07 08:00 | 62 | Dermiens, Guillaume v de Maio, Mauro | 5-7,0-6 | |
| ITF M25 Monastir | 02/06 08:00 | 62 | Dermiens, Guillaume v Valentin De Carvalho | 6-1,6-1 | |
| ITF - M15 Monastir | 11/22 12:30 | 62 | Dermiens, Guillaume v Martyn Pawelski | 2-6,4-6 | |
| ITF - M15 Monastir | 11/22 08:00 | 62 | Dermiens, Guillaume v Stone, Zakai | 6-2,6-2 | |
| ITF - M15 Monastir | 11/21 10:00 | 62 | Dermiens, Guillaume v Max Cunat | 6-1,6-4 | |
| ITF - M15 Monastir | 11/17 09:55 | 25 | Aziz Dougaz v Dermiens, Guillaume | 6-3,6-4 | |
| ITF - M15 Monastir | 11/15 13:00 | 62 | Dermiens, Guillaume v Jans, Jarno | 4-6,6-1,10-6 | |
| ITF - M15 Monastir | 11/15 08:00 | 62 | Dermiens, Guillaume v Martinez Irigoyen, Astur | 6-2,6-4 | |
| ITF - M15 Monastir | 11/10 12:00 | 25 | Gauthier Onclin v Dermiens, Guillaume | 6-1,6-1 | |
| ITF - M15 Monastir | 11/08 08:00 | 62 | Dermiens, Guillaume v Alessandro Coccioli | 6-4,6-2 | |
| ITF M25 Eupen | 09/07 09:30 | 62 | Dermiens, Guillaume v Cloes, Loic | 3-6,0-6 | |
| ITF M25 Eupen | 09/06 07:30 | 62 | Dermiens, Guillaume v Freire Da Silva, Adan | 7-6,6-1 | |
| ITF M25 Eupen | 09/05 09:00 | 62 | Dermiens, Guillaume v Panagoulopoulos, Gosse | 6-2,6-2 | |
| ITF M15 Huy | 08/24 09:20 | 44 | Dermiens, Guillaume v Sollie, Thorsten | 4-6,3-6 | |
| ITF M15 Huy | 08/23 11:35 | 44 | Dermiens, Guillaume v Tzicas, Charles | 6-3,6-0 | |
| ITF M15 Huy | 08/22 13:10 | 44 | Dermiens, Guillaume v Cedric Stanke | 6-3,6-1 | |
| ITF M25 Koksijde | 08/17 08:00 | 25 | Dermiens, Guillaume v Francesco Passaro | 2-6,1-6 | |
| ITF M25 Koksijde | 08/16 11:50 | 54 | Dermiens, Guillaume v Alen Moritz Hodzic | 6-4,6-3 | |
| ITF M15 Esch/Alzette | 07/21 14:25 | 26 | Dermiens, Guillaume v Patrick Kypson | 1-6,3-6 | |
| ITF M15 Esch/Alzette | 07/20 12:55 | 25 | Dermiens, Guillaume v Raphael Calzi | 1-6,6-4,6-4 | |
| ITF M15 Esch/Alzette | 07/19 09:00 | 54 | Lucas Szewczyk v Dermiens, Guillaume | 3-6,2-6 | |
| ITF M15 Esch/Alzette | 07/18 14:25 | 54 | Podzimek, Floris v Dermiens, Guillaume | 3-6,1-6 | |
| ITF M25 Marburg | 07/05 08:00 | 54 | Florian Broska v Dermiens, Guillaume | 7-5,6-4 | |
| ITF M25 Alkmaar | 06/23 12:55 | 25 | Dermiens, Guillaume v Ryan Nijboer | Retired | |
| ITF M25 Alkmaar | 06/21 14:25 | 54 | Dermiens, Guillaume v Eisinga, Zachary | 4-6,7-5,13-11 | |
| ITF M25 Alkmaar | 06/20 10:30 | 54 | Garanganga, Takanyi v Dermiens, Guillaume | 3-6,1-6 | |
| ITF - M15 Antalya | 06/08 07:00 | 62 | Franco Roncadelli v Dermiens, Guillaume | 6-2,6-0 | |
| ITF - M15 Antalya | 06/07 09:35 | 62 | Credit Chaiyarin v Dermiens, Guillaume | 0-6,4-6 |