Horacio Zeballos defeated Jorge Aguilar 7-6 6-4 in the Santiago CH round of 32 on clay. The upset overturned the form book — Jorge Aguilar came in defending last year's round of 32. Horacio Zeballos extended the head-to-head to 2–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2004-09-06 | Argentina F5 | QF | clay | Horacio Zeballos | 7-5 6-2 |
| 2004-04-26 | Argentina F1 | R16 | clay | Jorge Aguilar | 6-3 6-4 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.