Guillermo Hormazabal defeated Gaston Arturo Grimolizzi 6-1 7-5 in the Italy F5 round of 32 on clay. The result followed the form book — Guillermo Hormazabal came in leading the head-to-head 2–1. Guillermo Hormazabal extended the head-to-head to 3–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2010-11-01 | Chile F3 | R16 | clay | Gaston Arturo Grimolizzi | 6-7(3) 6-4 6-4 |
| 2007-11-12 | Chile F5 | F | clay | Guillermo Hormazabal | 6-0 6-4 |
| 2006-11-20 | Chile F5 | SF | clay | Guillermo Hormazabal | 6-2 6-1 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.