Dario Perez defeated Jonathan Gonzalia 1-6 6-1 6-2 in the Chile 1 4 round of 32 on clay. The upset overturned the form book — Jonathan Gonzalia came in leading the head-to-head 1–0. Dario Perez claimed a first win over Jonathan Gonzalia in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2003-08-25 | Argentina F2 | R32 | clay | Jonathan Gonzalia | 6-4 6-1 |