Jonathan Gonzalia defeated Dario Perez 6-4 6-1 in the Argentina F2 round of 32 on clay. The upset overturned the form book — Dario Perez came in leading the head-to-head 1–0, but Jonathan Gonzalia had been the form player, winning 5 of their last 9 on clay. Jonathan Gonzalia claimed a first win over Dario Perez in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2004-03-08 | Chile 1 4 | R32 | clay | Dario Perez | 1-6 6-1 6-2 |