Stadium: Court GS-3 Round: 62
| ITF Women Fort Worth | 2018/08/02 14:00 | Robin Anderson v Maria Jose Portillo Ramirez | 6-2,7-5 |
| ITF Women Fort Worth | 2018/07/31 18:55 | Maria Jose Portillo Ramirez v Nagi Hanatani | 6-3,6-3 |
| ITF Women Evansville | 2018/07/26 15:40 | Madurawe, Niluka v Maria Jose Portillo Ramirez | 6-3,6-4 |
| ITF Women Evansville | 2018/07/24 14:00 | Navarro, Brianda Rebeca v Maria Jose Portillo Ramirez | 0-6,0-6 |
| ITF Women Gatineau Qual | 2018/07/15 14:00 | Burrage, Jodie Anna v Maria Jose Portillo Ramirez | 6-1,6-2 |
| ITF Women Gatineau Qual | 2018/07/14 16:55 | Jada Bui v Maria Jose Portillo Ramirez | 5-7,3-6 |
| Fed Cup, Groupe Mondial | 2018/06/21 14:00 | Maria Jose Portillo Ramirez v Riley-Codrington, Tangia | 6-0,6-0 |
| ITF Women Sumter | 2018/06/13 18:15 | Maria Jose Portillo Ramirez v Alize Lim | 1-6,1-6 |
| ITF Women Fort Worth | 2018/08/04 16:45 | Maria Mateas v Schaefer, Dominique | 6-0,6-3 |
| ITF Women Fort Worth | 2018/08/03 18:20 | Schaefer, Dominique v Rhiann Newborn | 6-3,6-4 |
| ITF Women Fort Worth | 2018/08/02 14:00 | Olivia Tjandramulia v Schaefer, Dominique | 6-3,2-6,1-6 |
| ITF Women Fort Worth | 2018/07/31 17:20 | Schaefer, Dominique v Okuno, Ayaka | 6-4,6-3 |
| ITF Women Ashland Qual | 2018/07/22 19:25 | Catherine Harrison v Schaefer, Dominique | 6-2,6-2 |
| ITF Women Berkeley Qual | 2018/07/15 21:00 | Schaefer, Dominique v Stevenson, Alexandra | 6-4,4-6,2-6 |
| ITF Women Honolulu | 2018/07/11 20:00 | Schaefer, Dominique v Kolar, Nastja | 6-1,5-7,3-6 |
| ITF Women Honolulu Qual | 2018/07/10 20:00 | Salma Ewing v Schaefer, Dominique | 6-2,2-6,5-7 |