Nicolas Pastor defeated Daniel Alejandro Lopez Cassaccia 7-6 5-7 7-6 in the Argentina F7 round of 16 on clay. The upset overturned the form book — Daniel Alejandro Lopez Cassaccia came in leading the head-to-head 1–0, but Nicolas Pastor had been the form player, winning 5 of their last 8 on clay. Nicolas Pastor claimed a first win over Daniel Alejandro Lopez Cassaccia in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2011-05-23 | Paraguay F2 | R32 | clay | Daniel Alejandro Lopez Cassaccia | 5-1 |