Guillermo Hormazabal defeated Sebastian Quintero 7-6 6-2 in the Colombia F3 round of 16 on clay. The upset overturned the form book — Sebastian Quintero came in leading the head-to-head 1–0, but Guillermo Hormazabal had been the form player, winning 2 of their last 6 on clay. Guillermo Hormazabal claimed a first win over Sebastian Quintero in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2003-11-03 | Venezuela 4 | R32 | hard | Sebastian Quintero | 4-1 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.