Stadium: Court 1 Round: 25 Ground: Hardcourt outdoor
| ITF Women Campinas Qual | 2018/03/05 14:50 | Nemtsova, Stephanie v Maria Jose Portillo Ramirez | 6-2,6-3 |
| ITF Women Campinas Qual | 2018/03/04 14:00 | Bueno, Marcela-Guimaraes v Maria Jose Portillo Ramirez | 2-6,1-6 |
| ITF Women Campinas Qual | 2018/03/03 14:00 | Giudici, Leticia v Maria Jose Portillo Ramirez | 1-6,1-6 |
| Sao Paulo, Singles Qualifying W-WITF-BRA-02A | 2018/02/25 13:00 | Kordolaimi, Eleni v Maria Jose Portillo Ramirez | 7-5,6-4 |
| Sao Paulo, Singles Qualifying W-WITF-BRA-02A | 2018/02/24 12:00 | Vazquez, Maria Del Rosario 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 |
| Sharm El Sheikh, Singles W-WITF-EGY-09A | 2018/01/29 08:00 | Talbi, Shalimar v Maria Jose Portillo Ramirez | 6-2,6-4 |
| Sharm El Sheikh, Singles W-WITF-EGY-09A | 2018/01/28 08:00 | Stepan, Constanze v Maria Jose Portillo Ramirez | 1-6,2-6 |
| ITF Women Midland Qual | 2018/01/28 20:40 | Bovina, Elena v Sanchez, Maria | 2-6,7-5,6-2 |
| Wesley Chapel, Singles W-WITF-USA-03A | 2018/01/26 16:00 | Sanchez, Maria v Irina Maria Bara | 4-6,4-6 |
| Wesley Chapel, Singles W-WITF-USA-03A | 2018/01/25 15:30 | Robin Anderson v Sanchez, Maria | 5-7,2-6 |
| Wesley Chapel, Singles W-WITF-USA-03A | 2018/01/24 17:15 | Kyoka Okamura v Sanchez, Maria | 6-7,6-4,4-6 |
| Orlando, Singles Qualifying W-WITF-USA-02A | 2018/01/18 18:25 | Sanchez, Maria v Ayano Shimizu | 3-6,6-1,1-6 |
| Orlando, Singles Qualifying W-WITF-USA-02A | 2018/01/17 18:15 | Ianchuk, Olga v Sanchez, Maria | 3-6,5-7 |
| ITF Women Daytona Beach | 2018/01/10 22:40 | Jada Robinson v Sanchez, Maria | 6-2,6-4 |
| ITF Women Norman | 2017/11/18 17:50 | Sanchez, Maria v Sachia Vickery | 7-5,3-6,5-7 |