Stadium: Stadium Round: 25 Ground: Hardcourt outdoor
| ITF Women Santiago | 2016/11/21 23:00 | Guarachi Mathison, Alexa v Ana Sofia Sanchez | 6-4,6-2 |
| Irapuato, Singles Qualifying W-WITF-MEX-01A | 2018/03/11 17:30 | Guarachi Mathison, Alexa v Cardenas Rifka, Romary | 6-1,6-0 |
| Fed Cup, Groupe Mondial | 2018/02/10 17:00 | Guarachi Mathison, Alexa v Uzcategui, Aymet | 7-6,6-2 |
| Fed Cup, Groupe Mondial | 2018/02/09 17:00 | Guarachi Mathison, Alexa v Emiliana Arango | 2-6,6-7 |
| Fed Cup, Groupe Mondial | 2018/02/08 17:00 | Gonzalez, Montserrat v Guarachi Mathison, Alexa | 6-3,5-7,7-5 |
| ITF Women Midland Qual | 2018/01/28 18:45 | Jovic, J. v Guarachi Mathison, Alexa | 7-6,6-3 |
| WTA Newport Beach Qual | 2018/01/20 19:40 | Daniela Seguel v Guarachi Mathison, Alexa | 6-3,6-4 |
| ITF Women Orlando Qual | 2018/01/14 21:00 | Fernandez, Leylah Annie v Guarachi Mathison, Alexa | 7-6,6-4 |
| Daytona Beach, Singles Qualifying W-WITF-USA-01A | 2018/01/07 16:30 | van Nguyen, Chanelle v Guarachi Mathison, Alexa | 6-4,6-4 |
| Acapulco, Mexico, Qualifying | 2018/02/25 01:20 | Ana Sofia Sanchez v Marie Bouzkova | 1-6,2-6 |
| ITF Women Rancho Santa Fe | 2018/02/21 20:30 | Allie Kiick v Ana Sofia Sanchez | 6-4,6-3 |
| ITF Women Surprise | 2018/02/18 19:00 | Ana Sofia Sanchez v Yanina Wickmayer | 6-3,3-6,4-6 |
| ITF Women Surprise | 2018/02/17 19:30 | Ianchuk, Olga v Ana Sofia Sanchez | 4-6,6-7 |
| ITF Women Surprise | 2018/02/16 23:15 | Ana Sofia Sanchez v Marine Partaud | 6-4,7-5 |
| ITF Women Surprise | 2018/02/16 17:00 | Su Jeong Jang v Ana Sofia Sanchez | 5-7,2-6 |
| ITF Women Surprise | 2018/02/14 17:00 | Marker, Lauren v Ana Sofia Sanchez | 7-6,3-6,2-6 |
| Surprise, Singles Qualifying W-WITF-USA-05A | 2018/02/13 17:30 | Ana Sofia Sanchez v Scandalis, Zoe Gwen | 6-1,6-4 |