Stadium: Court 7 Round: 28 Ground: Hardcourt outdoor
| ITF Portugal F8 | 2018/04/20 10:00 | Niesten, Miliaan v Barry, Sam | 6-3,6-4 |
| ITF Portugal F8 | 2018/04/18 12:10 | Sao Thiago, Igor v Niesten, Miliaan | 1-6,3-6 |
| ITF Portugal F7 | 2018/04/12 12:20 | Niesten, Miliaan v Frederico Ferreira Silva | 0-6,5-7 |
| ITF Portugal F7 | 2018/04/11 09:00 | Prechtel, Sebastian v Niesten, Miliaan | 6-7,2-6 |
| ITF Portugal F7 Qual | 2018/04/09 10:00 | Niesten, Miliaan v Daniel Batista | 5-7,6-2,6-2 |
| ITF Portugal F7 Qual | 2018/04/08 16:00 | Niesten, Miliaan v Teixeira, Duarte Nuno | 6-3,6-3 |
| ITF Portugal F5 | 2018/03/21 14:10 | Vivero Gonzalez, Pablo v Niesten, Miliaan | 6-2,6-3 |
| ITF Portugal F5 Qual | 2018/03/19 11:00 | Niesten, Miliaan v Rodrigues, Pedro Gabriel | 6-1,6-4 |
| ITF Portugal F8 | 2018/04/20 12:40 | Monteiro, Joao v Cacao, Tiago | 4-6,5-7 |
| ITF Portugal F8 Qual | 2018/04/17 10:00 | Cacao, Tiago v Westerhof, Boy | 6-1,3-6,6-3 |
| ITF Portugal F7 | 2018/04/12 16:05 | Evan Furness v Cacao, Tiago | 6-4,6-0 |
| ITF Portugal F7 | 2018/04/11 09:30 | Cacao, Tiago v Maxime Janvier | 6-4,7-6 |
| ITF Portugal F6 | 2018/03/27 13:25 | Cacao, Tiago v Vivero Gonzalez, Pablo | 1-6,4-6 |
| ITF Portugal F5 | 2018/03/23 10:00 | Monteiro, Joao v Cacao, Tiago | 6-4,6-1 |
| ITF Portugal F5 Qual | 2018/03/22 13:20 | Cacao, Tiago v Lindell, Christian | 7-5,3-6,6-3 |
| ITF Portugal F5 | 2018/03/21 12:05 | Johan Nikles v Cacao, Tiago | 4-6,4-6 |