Frederica Piedade defeated Leticia Sobral 6-0 6-4 in the Mexico City 1 25K qualifying round on hard. The upset overturned the form book — Leticia Sobral came in leading the head-to-head 1–0. Frederica Piedade claimed a first win over Leticia Sobral in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2004-10-04 | Juarez 25K | R16 | clay | Leticia Sobral | 3-6 7-5 7-5 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.