Karen Castiblanco defeated Maria Claudia Santos Santanna 6-4 6-2 in the Lima 10K round of 32 on clay. The upset overturned the form book — Maria Claudia Santos Santanna came in leading the head-to-head 1–0, but Karen Castiblanco had been the form player, winning 4 of their last 9 on clay. Karen Castiblanco claimed a first win over Maria Claudia Santos Santanna in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2008-10-06 | Mogi Das Cruzes 10K | R16 | clay | Maria Claudia Santos Santanna | 6-2 6-2 |