Stadium: Court 12 Round: 62
| ITF Women Pelham Qual | 2018/04/08 15:00 | Charity Johns v Maria Jose Portillo Ramirez | 0-6,0-6 |
| ITF Women Irapuato | 2018/03/13 22:20 | Maria Jose Portillo Ramirez v Maria Sanchez | 1-6,1-6 |
| ITF Women Campinas Qual | 2018/03/05 14:50 | Stephanie Nemtsova v Maria Jose Portillo Ramirez | 6-2,6-3 |
| ITF Women Campinas Qual | 2018/03/04 14:00 | Marcela-Guimaraes Bueno v Maria Jose Portillo Ramirez | 2-6,1-6 |
| ITF Women Campinas Qual | 2018/03/03 14:00 | Leticia Giudici v Maria Jose Portillo Ramirez | 1-6,1-6 |
| ITF Women Sao Paulo Qual | 2018/02/25 13:00 | Eleni Kordolaimi v Maria Jose Portillo Ramirez | 7-5,6-4 |
| ITF Women Sao Paulo Qual | 2018/02/24 12:00 | Maria D R Vazquez v Maria Jose Portillo Ramirez | 3-6,4-6 |
| ITF Women Curitiba Qual | 2018/02/17 12:30 | Maria Jose Portillo Ramirez v Paula Ormaechea | 0-6,2-6 |
| ITF Women Pelham Qual | 2018/04/08 15:00 | Leila Koster v Andrea R Villarreal | 0-6,1-6 |
| WTA Monterrey Qual | 2018/03/31 20:25 | Miyu Kato v Andrea R Villarreal | 6-2,6-3 |
| ITF Women Irapuato | 2018/03/13 19:00 | Jacqueline Cako v Andrea R Villarreal | 6-3,3-6,6-1 |
| ITF Women Campinas | 2018/03/06 17:20 | Harmony Tan v Andrea R Villarreal | 6-0,6-0 |
| ITF Women Campinas Qual | 2018/03/05 16:45 | Andrea R Villarreal v Rafaela Rodrigues Dos Santos | 6-7,6-1,6-4 |
| ITF Women Campinas Qual | 2018/03/04 14:00 | Andrea R Villarreal v Maria Silva | 6-7,7-6,6-2 |
| ITF Women Sao Paulo Qual | 2018/02/24 15:30 | Andrea R Villarreal v Nika Kukharchuk | 2-6,4-6 |
| ITF Women Curitiba Qual | 2018/02/18 15:20 | Andrea R Villarreal v Carla Lucero | 1-6,0-6 |