Stadium: Court 2 Round: 62 Ground: Hardcourt outdoor
| ITF Portugal F4 | 2018/03/11 11:30 | Igor Marcondes v Guillaume Dermiens | 6-7,7-6,2-6 |
| ITF Portugal F3 | 2018/03/04 12:00 | Antonio P Neto v Guillaume Dermiens | 7-6,6-4 |
| ITF Portugal F2 Qual | 2018/02/24 10:00 | Guillaume Dermiens v Martim L Prata | 5-7,6-3,4-6 |
| ITF Turkey F43 | 2017/11/11 08:30 | Guillaume Dermiens v Moritz Trocker | 2-6,6-7 |
| ITF Turkey F38 | 2017/10/07 07:00 | Guillaume Dermiens v Jakob Johansson-Holm | 1-6,4-6 |
| ITF Turkey F37 | 2017/10/01 09:00 | Guillaume Dermiens v Philipp Schroll | 5-7,2-6 |
| ITF Turkey F36 | 2017/09/23 07:30 | Durukan Durmus v Guillaume Dermiens | 3-6,6-4,6-1 |
| ITF Belgium F10 Qual | 2017/08/20 12:35 | Alexis Klegou v Guillaume Dermiens | 6-2,6-1 |
| ITF Portugal F4 | 2018/03/10 11:00 | Lucas Hellfritsch v Loic Perret | 7-6,7-6 |
| ITF Netherlands F6 | 2017/08/19 10:00 | Tim Van Der Horst v Lucas Hellfritsch | 6-3,6-3 |
| ITF Germany F10 | 2017/08/06 08:00 | Benjamin Hassan v Lucas Hellfritsch | 6-3,6-4 |
| ITF Germany F9 | 2017/07/31 09:00 | Gavin Van Peperzeel v Lucas Hellfritsch | 7-6,6-4 |
| ITF Germany F9 | 2017/07/30 08:00 | Lucas Hellfritsch v Adriano Quinti | 5-7,6-3,7-6 |
| ITF Germany F4 | 2017/06/17 10:30 | Alexander Mannapov v Lucas Hellfritsch | 0-6,6-2,6-4 |
| ITF Greece F7 | 2016/10/22 09:30 | Marvin Schramm v Lucas Hellfritsch | 2-6,6-1,6-3 |
| ITF Germany F4 | 2016/06/18 08:00 | Lucas Hellfritsch v Benedict Moerl | 3-6,3-6 |