Mary Gambale defeated Frederica Piedade 6-2 3-6 7-6 in the Puebla 25K qualifying round on hard. The upset overturned the form book — Frederica Piedade came in leading the head-to-head 1–0. Mary Gambale claimed a first win over Frederica Piedade in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2004-10-11 | Mexico City 25K | SF | hard | Frederica Piedade | 6-4 6-1 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.