Stadium: Court 1 Round: 25 Ground: Hardcourt outdoor
| ITF Portugal F8 Qual | 2018/04/16 09:30 | Goncalo Falcao v Igor Sao Thiago | 6-4,6-1 |
| ITF Portugal F8 Qual | 2018/04/15 09:00 | Andre Rodeia v Igor Sao Thiago | 1-6,5-7 |
| ITF Portugal F3 | 2018/03/05 14:00 | Igor Sao Thiago v Jose-Ricardo Nunes | 1-6,4-6 |
| ITF Portugal F2 Qual | 2018/02/24 12:30 | Igor Sao Thiago v Pedro Vives Marcos | 6-7,1-6 |
| ITF Portugal F1 | 2018/02/17 12:30 | Rafael Tosetto v Igor Sao Thiago | 6-4,4-6,6-4 |
| ITF Peru F1 | 2017/12/10 22:00 | Igor Sao Thiago v Duilio Vallebuona | 4-6,2-6 |
| ITF Brazil F4 | 2017/11/28 13:10 | Daniel Dutra Da Silva v Igor Sao Thiago | 6-1,6-1 |
| ITF Brazil F4 | 2017/11/27 11:00 | Igor Sao Thiago v Joao M Nusdeo | 6-1,7-5 |
| ITF Portugal F7 | 2018/04/12 12:20 | Miliaan Niesten v Frederico Ferreira Silva | 0-6,5-7 |
| ITF Portugal F7 | 2018/04/11 09:00 | Sebastian Prechtel v Miliaan Niesten | 6-7,2-6 |
| ITF Portugal F7 Qual | 2018/04/09 10:00 | Miliaan Niesten v Daniel Batista | 5-7,6-2,6-2 |
| ITF Portugal F7 Qual | 2018/04/08 16:00 | Miliaan Niesten v Duarte Nuno Teixeira | 6-3,6-3 |
| ITF Portugal F5 | 2018/03/21 14:10 | Pablo Vivero Gonzalez v Miliaan Niesten | 6-2,6-3 |
| ITF Portugal F5 Qual | 2018/03/19 11:00 | Miliaan Niesten v Pedro Gabriel Rodrigues | 6-1,6-4 |
| ITF Portugal F5 Qual | 2018/03/18 12:30 | Miliaan Niesten v Jonathan Binding | 4-6,6-3,6-1 |
| ITF Portugal F4 | 2018/03/14 11:20 | Peter Bothwell v Miliaan Niesten | 6-4,6-2 |