Guillermo Duran defeated Juan Manuel Valverde 6-3 3-6 6-2 in the Argentina F9 round of 32 on clay. The upset overturned the form book — Juan Manuel Valverde came in leading the head-to-head 2–1. Guillermo Duran narrowed the head-to-head to 2–2.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2010-06-07 | Argentina F8 | SF | clay | Guillermo Duran | 4-6 6-3 6-3 |
| 2009-11-09 | Argentina F23 FUTURES | R16 | clay | Juan Manuel Valverde | 6-2 1-6 6-1 |
| 2008-06-23 | Brazil F10 Teresina PL | R32 | clay | Juan Manuel Valverde | 6-3 3-6 6-3 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.