Stadium: Court 3 Round: 45 Ground: Hardcourt outdoor
| ITF Netherlands F4 | 2018/08/16 10:30 | Mertens, Yannick v Kazuki Nishiwaki | 3-6,6-7 |
| ITF Netherlands F4 | 2018/08/14 14:15 | Mertens, Yannick v Sidane Pontjodikromo | 6-1,4-6,6-4 |
| Challenger Pullach Qual | 2018/08/04 15:25 | Mertens, Yannick v Steven Diez | 2-6,2-6 |
| Challenger Astana | 2018/07/17 07:45 | Mertens, Yannick v Jurij Rodionov | 5-7,0-6 |
| ITF France F13 | 2018/07/13 17:20 | Mertens, Yannick v Sora Fukuda | 6-2,3-6,4-6 |
| ITF France F13 | 2018/07/12 18:30 | Mertens, Yannick v Lakat, Florian | 6-3,6-4 |
| ITF France F13 | 2018/07/10 13:40 | Mertens, Yannick v Voljacques, Hugo | 6-2,6-2 |
| Challenger Recanati Qual | 2018/07/02 10:00 | Tomas Barrios Vera v Mertens, Yannick | 7-6,6-3 |
| Challenger Pullach Qual | 2018/08/04 15:25 | Zizou Bergs v Simon, Tobias | 6-4,7-6 |
| ITF Italy F21 | 2018/08/03 14:30 | Souza, Joao Olavo v Simon, Tobias | 7-6,7-6 |
| ITF Italy F21 | 2018/08/02 13:00 | Simon, Tobias v Balzerani, Riccardo | 6-2,7-6 |
| ITF Italy F21 | 2018/08/01 15:20 | Simon, Tobias v Luca Tomasetto | 7-6,6-3 |
| ITF Italy F21 | 2018/07/31 18:00 | Simon, Tobias v Rieder, Horst | 6-2,6-4 |
| ITF Portugal F12 | 2018/07/27 11:30 | Nuno Borges v Simon, Tobias | 6-7,6-2,6-4 |
| ITF Portugal F12 | 2018/07/26 15:00 | Carr, Simon v Simon, Tobias | 4-6,3-6 |
| ITF Portugal F12 | 2018/07/25 14:50 | Daniel Batista v Simon, Tobias | 4-6,3-6 |