Fernanda Hermenegildo defeated Maria Fernanda Alvarez Teran 6-4 7-6 in the Obregon 10K round of 16 on hard. The upset overturned the form book — Maria Fernanda Alvarez Teran came in leading the head-to-head 2–1. Fernanda Hermenegildo narrowed the head-to-head to 2–2.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2011-03-14 | Metepec 10K | R32 | hard | Maria Fernanda Alvarez Teran | 7-5 6-0 |
| 2010-05-10 | Rio de Janeiro 25K | R32 | clay | Fernanda Hermenegildo | 6-1 6-3 |
| 2005-10-10 | Tucuman 10K | R16 | clay | Maria Fernanda Alvarez Teran | 6-2 6-1 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.