Maria Fernanda Alvarez Teran defeated Stacey Tan 7-5 6-2 in the San Luis Potosi 25K round of 16 on hard. The upset overturned the form book — Stacey Tan came in leading the head-to-head 1–0. Maria Fernanda Alvarez Teran claimed a first win over Stacey Tan in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2009-01-26 | Laguna Nigel CA 25K | R32 | hard | Stacey Tan | 3-6 7-6(2) 6-2 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.