Stadium: Court 3 Round: 25 Ground: Clay
| ITF M15 Doha | 2019/03/13 12:00 | Jesper De Jong v Guy Den Heijer | 7-5,6-4 |
| ITF M15 Doha | 2019/03/12 13:30 | Michal Konecny v Guy Den Heijer | 6-4,6-7,3-6 |
| ITF M15 Doha | 2019/03/11 13:55 | Alexandru Vasile Manole v Guy Den Heijer | 2-6,1-6 |
| ITF M15 Doha | 2019/03/11 09:45 | Brian Bencic v Guy Den Heijer | 4-6,1-6 |
| ITF M15 Doha | 2019/03/07 12:00 | Guy Den Heijer v Ricardo Rodriguez-Pace | 4-6,3-6 |
| ITF M15 Doha | 2019/03/06 13:30 | Jabor Mohammed Ali Mutawa v Guy Den Heijer | 1-6,3-6 |
| ITF M15 Doha | 2019/03/05 12:00 | Michiel de Krom v Guy Den Heijer | 5-7,6-3,9-11 |
| ITF M15 Doha | 2019/03/04 13:50 | Yanik Kaelin v Guy Den Heijer | 3-6,4-6 |
| ITF Czech Republic F11 Qual | 2018/11/19 11:00 | Ondrej Krstev v Guillaume Dermiens | 6-2,6-2 |
| ITF Belgium F9 | 2018/08/21 09:00 | Guillaume Dermiens v Dan Added | 3-6,1-6 |
| ITF Belgium F8 | 2018/08/14 09:00 | Guillaume Dermiens v Alex Knaff | 1-6,4-6 |
| ITF Belgium F7 | 2018/08/07 09:10 | Maxime Chazal v Guillaume Dermiens | 6-1,6-1 |
| ITF Belgium F6 Qual | 2018/07/28 07:00 | Julien De Cuyper v Guillaume Dermiens | 6-3,0-6,6-2 |
| ITF Belgium F5 | 2018/07/21 11:00 | Flemming Peters v Guillaume Dermiens | 7-6,6-4 |
| ITF Belgium F5 | 2018/07/21 07:00 | Guillaume Dermiens v Joaquin P M Bannen | 6-2,6-2 |
| ITF Belgium F4 | 2018/07/14 08:30 | Jakub Wojcik v Guillaume Dermiens | 6-1,6-2 |