Stadium: Court 13 Round: 25 Ground: Clay
| ITF Portugal F8 | 2018/04/21 14:10 | Niesten, Miliaan v Cacao, Tiago | 4-6,5-7 |
| 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 Spain F9 | 2018/04/18 08:00 | Javier Barranco Cosano v Romero de Avila Senise, Alberto | 4-6,6-1,6-4 |
| ITF Spain F9 Qual | 2018/04/15 10:30 | Romero de Avila Senise, Alberto v Mario G Fernandez | 6-3,6-1 |
| ITF Spain F9 Qual | 2018/04/14 10:00 | Romero de Avila Senise, Alberto v Pol Martin Tiffon | 6-2,4-6,6-1 |
| Challenger Alicante Qual | 2018/04/01 08:30 | Elliot Benchetrit v Romero de Avila Senise, Alberto | 6-0,6-4 |
| Challenger Alicante Qual | 2018/03/31 12:20 | Jordan Correia Passos Do Carmo v Romero de Avila Senise, Alberto | 5-7,2-6 |
| Challenger Marbella Qual | 2018/03/24 15:00 | Romero de Avila Senise, Alberto v de Greef, Arthur | 2-6,4-6 |
| ITF Spain F7 | 2018/03/21 09:00 | Romero de Avila Senise, Alberto v Raul Brancaccio | 3-6,6-3,4-6 |
| ITF Spain F7 | 2018/03/20 14:00 | Romero de Avila Senise, Alberto v Muniz Hidalgo, Antonio | 6-2,6-1 |