Guillermo Hormazabal defeated Sebastian Uriarte 6-3 6-3 in the Chile F2 round of 16 on clay. The upset overturned the form book — Sebastian Uriarte came in leading the head-to-head 2–0. Guillermo Hormazabal claimed a first win over Sebastian Uriarte in three meetings, narrowing the head-to-head to 2–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2005-11-07 | Chile F6 | R32 | clay | Sebastian Uriarte | 7-6(7) 3-0 |
| 2002-06-24 | Chile F2 | R32 | clay | Sebastian Uriarte | 6-2 6-4 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.