Stadium: 4 Round: 25 Ground: Clay
| ITF Belgium F7 Qual | 2018/08/06 09:00 | Nico Mertens v Antoine Damiens | 6-7,4-6 |
| ITF Belgium F7 Qual | 2018/08/05 08:00 | Nico Mertens v Oscar Matias Leiva Biason | 6-1,6-0 |
| ITF Germany F10 | 2018/08/01 14:05 | Nico Mertens v Facundo Mena | 2-6,2-6 |
| ITF Germany F10 Qual | 2018/07/30 12:00 | Nico Mertens v Osni Junior | 4-6,5-7 |
| ITF Germany F10 Qual | 2018/07/29 15:30 | Nico Mertens v Niklas Koch | 6-4,7-6 |
| ITF Germany F9 | 2018/07/24 10:00 | Nico Mertens v Manuel Guinard | 0-6,6-4,4-6 |
| ITF Bosnia and Herzegovina F3 | 2018/05/29 10:40 | Nico Mertens v Nerman Fatic | 4-6,3-6 |
| ITF Czech Republic F2 Qual | 2018/05/21 08:00 | Nico Mertens v Michal Franek | 3-6,2-6 |
| ITF Austria F6 | 2018/08/06 14:35 | Alejo Vilaro v Omar Giacalone | 6-3,3-6,4-6 |
| ITF Austria F5 | 2018/07/31 08:00 | Alejo Vilaro v Yvo Panak | 0-6,5-7 |
| ITF Germany F9 | 2018/07/25 10:00 | Alejo Vilaro v Mats Rosenkranz | 2-6,3-6 |
| ITF Germany F9 | 2018/07/24 10:00 | Jan Soeren Hain v Alejo Vilaro | 5-7,4-6 |
| ITF Germany F8 | 2018/07/19 11:35 | Alejo Vilaro v Joao Souza | 6-4,1-6,4-6 |
| ITF Germany F8 | 2018/07/18 09:30 | Alejo Vilaro v Bastien Presuhn | 6-3,6-4 |
| ITF Germany F8 Qual | 2018/07/16 09:30 | Alejo Vilaro v Arthur Reymond | 6-2,3-6,3-6 |
| ITF Germany F8 Qual | 2018/07/15 08:30 | Alejo Vilaro v Max Steinberger | 6-2,6-1 |