Catalina Pella defeated Karen Castiblanco 6-4 6-4 in the Londrina 10K round of 16 on clay. The upset overturned the form book — Karen Castiblanco came in leading the head-to-head 3–1, but Catalina Pella had been the form player, winning 3 of their last 4 on clay. Catalina Pella narrowed the head-to-head to 3–2.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2011-11-28 | Rosario 25K | R32 | clay | Karen Castiblanco | – |
| 2010-06-14 | Buenos Aires 10K | R16 | clay | Catalina Pella | 7-5 1-6 7-6(5) |
| 2010-06-07 | Cordoba 10K | R32 | clay | Karen Castiblanco | 6-4 2-6 6-2 |
| 2008-09-01 | Buenos Aires Garin 10K | R32 | clay | Karen Castiblanco | 6-2 7-5 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.