Stadium: Court Central Round: 25 Ground: Hardcourt outdoor
| ITF Belgium F5 | 2016/07/17 13:00 | Bemelmans, Ruben v Mertens, Yannick | 6-3,6-7,6-1 |
| Challenger - Lille | 2018/03/20 18:05 | Olaso, Guillermo v Mertens, Yannick | 5-7,6-1,6-3 |
| ITF Israel F1 | 2018/03/08 08:00 | Mertens, Yannick v Gianluca Mager | 7-5,6-3 |
| ITF Israel F1 | 2018/03/07 09:40 | Mertens, Yannick v Ferrando, Nicolas | 6-2,6-2 |
| ITF Israel F1 | 2018/03/06 11:35 | Mertens, Yannick v Niklas-Salminen, Patrick | 6-3,6-3 |
| ITF Portugal F1 | 2018/02/24 13:05 | Mertens, Yannick v Cacao, Tiago | 3-6,6-4,4-6 |
| ITF Portugal F1 | 2018/02/23 11:25 | Mertens, Yannick v Ribeiro Marcondes, Igor | 3-6,6-4,6-1 |
| ITF Portugal F1 | 2018/02/22 15:05 | Mertens, Yannick v Fermosell, Jaime | 7-5,6-2 |
| ITF Portugal F1 | 2018/02/20 11:45 | Mertens, Yannick v Bogajo Fernandez, Fernando | 7-6,6-1 |
| Miami, USA, Qualifying | 2018/03/20 14:00 | Bemelmans, Ruben v Alex De Minaur | 4-6,3-6 |
| Miami, USA, Qualifying | 2018/03/19 15:35 | Bemelmans, Ruben v Souza, Joao Olavo | 7-5,6-3 |
| ATP - Indian Wells | 2018/03/11 21:20 | Bemelmans, Ruben v Mayer, Leonardo | 4-6,1-6 |
| Indian Wells, USA, Qualifying | 2018/03/07 19:00 | Bemelmans, Ruben v Smyczek, Tim | 3-6,6-7 |
| Indian Wells, USA, Qualifying | 2018/03/06 20:35 | Bemelmans, Ruben v Tristan Boyer | 6-1,7-6 |
| ATP - Marseille | 2018/02/20 13:20 | Bemelmans, Ruben v Karen Khachanov | 3-6,6-7 |
| ATP Marseille Qual | 2018/02/19 11:00 | Bemelmans, Ruben v Calvin Hemery | 6-4,6-4 |
| ATP Marseille Qual | 2018/02/18 09:00 | Bemelmans, Ruben v Marti, Javier | 6-1,6-1 |