Antonio Pastorino defeated Jhonnatan Medina Alvarez 6-1 6-2 in the Argentina F5 round of 32 on clay. The upset overturned the form book — Jhonnatan Medina Alvarez came in leading the head-to-head 1–0. Antonio Pastorino claimed a first win over Jhonnatan Medina Alvarez in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2003-04-21 | Chile F3 | R16 | clay | Jhonnatan Medina Alvarez | 7-5 7-6(4) |