Gustavo Guerses defeated Patricio Heras 6-1 6-3 in the Chile 11 round of 16 on clay. The upset overturned the form book — Patricio Heras came in leading the head-to-head 1–0. Gustavo Guerses claimed a first win over Patricio Heras in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2011-12-05 | Brazil F42 | R16 | clay | Patricio Heras | 6-0 6-3 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.