Karen Castiblanco defeated Maria Sol Rotondo 3-6 6-2 6-4 in the Florianopolis 10K round of 16 on clay. The upset overturned the form book — Maria Sol Rotondo came in leading the head-to-head 1–0. Karen Castiblanco claimed a first win over Maria Sol Rotondo in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2007-05-07 | Cordoba 10K | R32 | clay | Maria Sol Rotondo | 6-3 6-4 |