Stadium: Pista Central Round: 25 Ground: Clay
| ITF Portugal F15 | 2017/08/09 14:35 | Antonio Cembellin Prieto v Victor Poncelet | 4-6,4-6 |
| ITF Portugal F15 | 2017/08/07 09:00 | Gabriel Ciro Da Silva v Antonio Cembellin Prieto | 1-6,2-6 |
| ITF Portugal F15 | 2017/08/05 11:00 | Antonio Cembellin Prieto v Daniil Klimov | 6-1,6-2 |
| ITF Portugal F13 | 2017/07/26 10:35 | Makoto Ochi v Antonio Cembellin Prieto | 6-2,6-4 |
| ITF Portugal F13 | 2017/07/24 12:30 | Antonio Cembellin Prieto v Jose Von Hafe Perez | 6-3,6-1 |
| ITF Portugal F13 | 2017/07/23 09:00 | Bruno Mardones v Antonio Cembellin Prieto | 5-7,2-6 |
| ITF Portugal F12 | 2017/07/19 08:30 | Antonio Cembellin Prieto v Maxime Tchoutakian | 0-6,2-6 |
| ITF Portugal F12 | 2017/07/18 08:00 | Antonio Cembellin Prieto v Grega Boh | 6-2,6-2 |
| ITF France F10 | 2018/06/19 11:15 | Guillermo Olaso v Eduard Guell Bartrina | 4-6,6-3,7-6 |
| Challenger Poznan Qual | 2018/06/04 13:30 | Jeremy Jahn v Guillermo Olaso | 6-7,6-1,6-2 |
| Challenger Poznan Qual | 2018/06/04 08:00 | Ronald Slobodchikov v Guillermo Olaso | 4-6,6-3,1-6 |
| Challenger Poznan Qual | 2018/06/03 09:25 | Juan Pablo Ficovich v Guillermo Olaso | 4-6,2-6 |
| Challenger Busan Qual | 2018/05/14 02:00 | Rubin Statham v Guillermo Olaso | 6-4,6-2 |
| Challenger Busan Qual | 2018/05/13 02:00 | Thomas Fancutt v Guillermo Olaso | 1-6,5-7 |
| Challenger Busan Qual | 2018/05/12 01:00 | Jae Hwan Kim v Guillermo Olaso | 0-6,5-7 |
| Challenger Glasgow | 2018/05/04 09:30 | Lukas Lacko v Guillermo Olaso | 6-2,6-3 |