Stadium: Court 6 Round: 27 Ground: Hardcourt outdoor
| 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 |
| ITF Great Britain F3 | 2018/02/13 12:15 | Evan Furness v Mertens, Yannick | 4-6,7-5,6-4 |
| ITF Great Britain F1 | 2018/02/04 11:00 | Griekspoor, Scott v Mertens, Yannick | 6-1,7-6 |
| ITF Great Britain F1 | 2018/02/03 10:00 | Mertens, Yannick v Viola, Matteo | 7-6,6-1 |
| ITF Great Britain F1 | 2018/02/02 10:00 | Pauffley, Neil v Mertens, Yannick | 6-7,4-6 |
| ITF Great Britain F1 | 2018/02/01 13:40 | Rosenzweig, Nicolas v Mertens, Yannick | 0-6,6-3,4-6 |
| ITF Great Britain F1 | 2018/01/31 13:45 | Aidan Mchugh v Mertens, Yannick | 6-7,2-6 |
| ITF Portugal F1 | 2018/02/22 10:00 | Ribeiro Marcondes, Igor v Faria, Luis | 6-7,6-4,6-4 |
| ITF Portugal F1 | 2018/02/21 14:45 | Antonio, Joao v Ribeiro Marcondes, Igor | 0-6,2-6 |
| ITF Peru F2 | 2017/12/18 18:30 | Ribeiro Marcondes, Igor v Ore, I. A. | 5-7,5-7 |
| ITF Peru F1 | 2017/12/11 19:00 | Matias Franco Descotte v Ribeiro Marcondes, Igor | 4-6,6-0,7-6 |
| ITF Brazil F4 | 2017/11/29 12:00 | Ribeiro Marcondes, Igor v Matos, Rafael | 3-6,3-6 |
| ITF Brazil F4 | 2017/11/27 15:00 | Matheus P De Almeida v Ribeiro Marcondes, Igor | 4-6,2-6 |
| ITF Brazil F2 | 2017/11/16 13:00 | Wilson Leite v Ribeiro Marcondes, Igor | 7-6,6-2 |
| ITF Brazil F2 | 2017/11/14 17:40 | Ribeiro Marcondes, Igor v Gabriel P Tumasonis | 6-3,6-4 |