Stadium: Court 5 Round: 28 Ground: Hardcourt outdoor
| ITF Portugal F11 | 2016/09/30 13:00 | Mertens, Yannick v Cacao, Tiago | 6-3,7-6 |
| 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 |
| 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 Portugal F1 | 2018/02/23 11:35 | Cacao, Tiago v Patael, Ben | 1-6,6-1,6-3 |
| ITF Portugal F1 | 2018/02/21 12:40 | Cacao, Tiago v Mardones, Bruno | 6-4,6-1 |
| ITF Spain F2 | 2018/01/21 11:30 | Brydolf, Patrik v Cacao, Tiago | 6-2,7-6 |
| ITF Spain F1 | 2018/01/16 12:55 | Munoz-De la Nava, Daniel v Cacao, Tiago | 6-2,6-4 |
| ITF Spain F1 | 2018/01/15 09:00 | Cacao, Tiago v Mancineiras Cornella, Oscar | 6-2,6-3 |
| ITF Spain F1 | 2018/01/14 09:00 | Cacao, Tiago v Hugounenq, Arthur | 6-2,6-2 |
| ITF Spain F1 | 2018/01/13 11:00 | Cacao, Tiago v Ontica, Cosmin | 6-1,6-3 |
| ITF Tunisia F33 | 2017/11/01 12:00 | Cacao, Tiago v Perchicot, Mathieu | 1-6,4-6 |