Maria Constanza De Las Mercedes Vega defeated Fernanda Brito 6-1 6-4 in the Lima 10K qualifying round on clay. The upset overturned the form book — Fernanda Brito came in leading the head-to-head 2–0. Maria Constanza De Las Mercedes Vega claimed a first win over Fernanda Brito in three meetings, narrowing the head-to-head to 2–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2015-07-27 | Buenos Aires $10K | QF | clay | Fernanda Brito | 3-6 5-3 |
| 2013-09-16 | Rosario 10K | QF | clay | Fernanda Brito | 1-6 7-5 7-5 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.