Guillermo Duran defeated Patricio Heras 6-4 4-6 6-2 in the Brazil F20 qualifying round on clay. The upset overturned the form book — Patricio Heras 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 |
|---|---|---|---|---|---|
| 2014-02-03 | Argentina F2 | R32 | clay | Patricio Heras | 6-1 6-2 |
| 2011-09-26 | Argentina F17 | SF | clay | Guillermo Duran | 7-5 6-2 |
| 2010-05-03 | Argentina F5 | SF | clay | Patricio Heras | 7-6(2) 6-4 |
Averages over each player's completed matches in the selected window (40 vs 48). 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