Gaston Arturo Grimolizzi defeated Jonathan Gonzalia 6-4 7-5 in the Argentina F16 qualifying round on clay. The upset overturned the form book — Jonathan Gonzalia came in leading the head-to-head 3–1. Gaston Arturo Grimolizzi narrowed the head-to-head to 3–2.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2009-11-09 | Argentina F23 FUTURES | R32 | clay | Gaston Arturo Grimolizzi | 6-0 6-7(5) 6-2 |
| 2008-09-01 | Argentina F9 | F | clay | Jonathan Gonzalia | 4-6 6-4 6-3 |
| 2007-10-29 | Chile F3 | R32 | clay | Jonathan Gonzalia | 6-3 6-4 |
| 2007-10-01 | Argentina F17 | QF | clay | Jonathan Gonzalia | 6-0 6-1 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.