Daniel Alejandro Lopez Cassaccia defeated Guillermo Duran 3-6 6-4 6-2 in the Uruguay F1 round of 16 on clay. The upset overturned the form book — Guillermo Duran came in leading the head-to-head 1–0, but Daniel Alejandro Lopez Cassaccia had been the form player, winning 3 of their last 8 on clay. Daniel Alejandro Lopez Cassaccia claimed a first win over Guillermo Duran in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2011-05-16 | Paraguay F1 | R16 | clay | Guillermo Duran | 3-6 7-5 6-1 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.