Stadium: Court 1 Round: 44 Ground: Hardcourt outdoor
| ITF Belgium F4 Qual | 2017/07/08 12:15 | Constant De La Bassetiere v Guillaume Dermiens | 6-3,6-1 |
| ITF - M15 Monastir | 2021/03/07 08:00 | Guillaume Dermiens v Matteo Tinelli | 3-6,7-5,10-7 |
| ITF - M15 Monastir | 2021/03/01 08:00 | Guillaume Dermiens v Alexander Kotzen | 1-6,5-7 |
| ITF - M15 Monastir | 2021/02/28 08:00 | Guillaume Dermiens v Marco Corino | 6-0,6-2 |
| ITF - M15 Monastir | 2021/02/22 08:00 | Kazuma Kawachi v Guillaume Dermiens | 7-6,5-7,10-8 |
| ITF - M15 Sharm El Sheikh | 2020/11/02 10:30 | Guillaume Dermiens v Taha Baadi | 7-6,2-6,8-10 |
| ITF - M15 Sharm El Sheikh | 2020/11/01 12:00 | Leonid Sheyngezikht v Guillaume Dermiens | 3-6,2-6 |
| ITF - M15 Sharm El Sheikh | 2020/10/25 09:00 | Guillaume Dermiens v Tristan Boyer | 2-6,2-6 |
| ITF - M15 Sharm El Sheikh | 2020/10/19 07:00 | Evgeny Philippov v Guillaume Dermiens | 6-4,1-6,10-8 |
| ITF - M15 Monastir | 2021/03/07 08:00 | Constant De La Bassetiere v Vladislav Melnic | 6-4,6-3 |
| ITF - M15 Monastir | 2021/03/03 08:30 | Mohamed Aziz Dougaz v Constant De La Bassetiere | 6-3,3-6,6-2 |
| ITF - M15 Monastir | 2021/03/01 14:30 | Luca Castagnola v Constant De La Bassetiere | 1-6,2-6 |
| ITF - M15 Monastir | 2021/03/01 09:00 | Constant De La Bassetiere v Vladislav Melnic | 7-6,6-0 |
| ITF - M15 Monastir | 2021/02/28 12:00 | Ervin H Eminefendic v Constant De La Bassetiere | 2-6,0-6 |
| ITF - M15 Monastir | 2021/02/22 08:00 | Omar Giacalone v Constant De La Bassetiere | 6-7,7-5,10-2 |
| ITF - M15 Monastir | 2021/02/21 12:00 | Alberto Orso v Constant De La Bassetiere | 5-7,2-6 |
| ITF - M15 Monastir | 2021/02/17 08:00 | Tom Kocevar-Desman v Constant De La Bassetiere | 6-1,6-4 |