Valentina Castro defeated Micaela Moran 7-5 6-4 in the Guayaquil 10K round of 32 on hard. The upset overturned the form book — Micaela Moran came in leading the head-to-head 1–0. Valentina Castro claimed a first win over Micaela Moran in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2004-10-25 | Los Mochis 10K | R16 | clay | Micaela Moran | 6-4 1-6 7-6(2) |