Karen Castiblanco defeated Estefania Donnet 6-4 6-4 in the Cordoba 10K round of 16 on clay. The upset overturned the form book — Estefania Donnet came in leading the head-to-head 1–0. Karen Castiblanco claimed a first win over Estefania Donnet in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2010-07-26 | Cochabamba 10K | SF | clay | Estefania Donnet | 6-2 4-6 6-4 |