Valentina Castro defeated Gabriela Velasco Andreu 7-5 6-3 in the Asuncion 10K round of 32 on clay. The upset overturned the form book — Gabriela Velasco Andreu came in leading the head-to-head 1–0. Valentina Castro claimed a first win over Gabriela Velasco Andreu in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2003-10-20 | Valencia 10K | R32 | hard | Gabriela Velasco Andreu | 6-2 6-2 |