| ITF Women Lubbock | 09/15 14:00 | 62 | Maria Jose Portillo Ramirez v Dominique Schaefer | 6-7,5-7 | |
| ITF Women Fort Worth | 08/02 14:00 | 26 | [333] Robin Anderson v Maria Jose P Ramirez [449] | 6-2,7-5 | |
| ITF Women Fort Worth | 07/31 18:55 | 25 | [449] Maria Jose P Ramirez v Nagi Hanatani [419] | 6-3,6-3 | |
| ITF Women Evansville | 07/26 15:40 | 26 | Niluka Madurawe v Maria Jose P Ramirez | 6-3,6-4 | |
| ITF Women Evansville | 07/24 14:00 | 25 | Brianda R Navarro v Maria Jose P Ramirez | 0-6,0-6 | |
| ITF Women Gatineau Qual | 07/15 14:00 | 54 | [463] Jodie Anna Burrage v Maria Jose P Ramirez [450] | 6-1,6-2 | |
| ITF Women Gatineau Qual | 07/14 16:55 | 54 | Jada Bui v Maria Jose P Ramirez | 5-7,3-6 | |
| 2018 Fed Cup | 06/21 14:00 | - | Maria Jose Portillo Ramirez v Tangia Riley-Codrington | 6-0,6-0 | |
| ITF Women Sumter | 06/13 18:15 | 25 | [448] Maria Jose Portillo Ramirez v Alize Lim [312] | 1-6,1-6 | |
| ITF Women Sumter Qual | 06/12 13:00 | 62 | Maria Jose Portillo Ramirez v Gianna Pielet | 6-2,6-3 | |
| ITF Women Sumter Qual | 06/11 13:00 | 62 | Maria Jose Portillo Ramirez v Peyton Stearns | 7-6,7-6 | |
| ITF Women Sumter Qual | 06/10 13:00 | 62 | Maria Jose Portillo Ramirez v Savannah Broadus | 1-6,6-4,6-4 | |
| ITF Women Bethany Beach Qual | 06/05 13:00 | 62 | Maria Jose Portillo Ramirez v Elysia Bolton | 6-7,3-6 | |
| ITF Women Tacarigua | 05/12 15:00 | 29 | Maria Jose Portillo Ramirez v Andrea R Villarreal | 6-2,6-2 | |
| ITF Women Tacarigua | 05/11 17:00 | 28 | Maria Jose Portillo Ramirez v Fodor Csilla | 6-7,6-0,7-6 | |
| ITF Women Tacarigua | 05/10 15:00 | 27 | Emily Appleton v Maria Jose Portillo Ramirez | 4-6,4-6 | |
| ITF Women Tacarigua | 05/09 18:30 | 26 | Maria Jose Portillo Ramirez v Catherine Leduc | 6-4,6-2 | |
| ITF Women Tacarigua | 05/07 14:00 | 25 | Maria Jose Portillo Ramirez v Rushri Wijesundera | 6-2,7-6 | |
| ITF Women Pelham Qual | 04/09 15:00 | 62 | Maria Jose Portillo Ramirez v Andrea R Villarreal | 6-2,3-6,6-7 | |
| ITF Women Pelham Qual | 04/08 15:00 | 62 | Charity Johns v Maria Jose Portillo Ramirez | 0-6,0-6 | |
| ITF Women Irapuato | 03/13 22:20 | 25 | Maria Jose P Ramirez v Maria Sanchez | 1-6,1-6 | |
| ITF Women Campinas Qual | 03/05 14:50 | 62 | Stephanie Nemtsova v Maria Jose Portillo Ramirez | 6-2,6-3 | |
| ITF Women Campinas Qual | 03/04 14:00 | 62 | Marcela-Guimaraes Bueno v Maria Jose Portillo Ramirez | 2-6,1-6 | |
| ITF Women Campinas Qual | 03/03 14:00 | 62 | Leticia Giudici v Maria Jose Portillo Ramirez | 1-6,1-6 | |
| ITF Women Sao Paulo Qual | 02/25 13:00 | 62 | Eleni Kordolaimi v Maria Jose Portillo Ramirez | 7-5,6-4 | |
| ITF Women Sao Paulo Qual | 02/24 12:00 | 62 | Maria D R Vazquez v Maria Jose Portillo Ramirez | 3-6,4-6 | |
| ITF Women Curitiba Qual | 02/17 12:30 | 62 | Maria Jose Portillo Ramirez v Paula Ormaechea | 0-6,2-6 | |
| ITF Women Sharm El Sheikh | 01/29 08:00 | 44 | Shalimar Talbi v Maria Jose Portillo Ramirez | 6-2,6-4 | |
| ITF Women Sharm El Sheikh | 01/28 08:00 | 44 | Constanze Stepan v Maria Jose Portillo Ramirez | 1-6,2-6 | |
| ITF Women Sharm El Sheikh | 01/22 08:00 | 44 | Maria Jose Portillo Ramirez v Katyarina Paulenka | 3-6,0-6 |