Lucas Engel defeated Jorge Aguilar 6-2 3-6 6-3 in the Chile F4 round of 32 on clay. The upset overturned the form book — Jorge Aguilar came in leading the head-to-head 2–1. Lucas Engel narrowed the head-to-head to 2–2.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2004-10-04 | Colombia F3 | R16 | clay | Lucas Engel | 5-7 6-4 6-2 |
| 2004-01-12 | El Salvador F1 | R16 | clay | Jorge Aguilar | 3-6 6-2 6-3 |
| 2003-09-15 | Bolivia F2 | R32 | clay | Jorge Aguilar | 6-3 1-0 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.