Guillermo Duran defeated Gaston Arturo Grimolizzi 6-4 6-2 in the Argentina F4 round of 32 on clay. The upset overturned the form book — Gaston Arturo Grimolizzi came in leading the head-to-head 3–0. Guillermo Duran claimed a first win over Gaston Arturo Grimolizzi in four meetings, narrowing the head-to-head to 3–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2011-09-26 | Argentina F17 | F | clay | Gaston Arturo Grimolizzi | 6-3 7-6(7) |
| 2008-05-05 | Argentina F1 | R32 | clay | Gaston Arturo Grimolizzi | 6-1 6-4 |
| 2006-11-20 | Chile F5 | R32 | clay | Gaston Arturo Grimolizzi | 6-2 1-6 6-3 |
Averages over each player's completed matches in the selected window (33 vs 33). ATP, WTA & Challenger.
Each player's serve crossed against the other's return, converted to expected hold of serve. Recent completed matches, ATP, WTA & Challenger. About