Juan Carlos Saez defeated Joaquin Jesus Monteferrario 3-6 6-1 6-4 in the Chile F9 round of 16 on clay. The upset overturned the form book — Joaquin Jesus Monteferrario came in leading the head-to-head 1–0, but Juan Carlos Saez had been the form player, winning 6 of their last 10 on clay. Juan Carlos Saez claimed a first win over Joaquin Jesus Monteferrario in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2009-08-24 | Bolivia F1 | R16 | clay | Joaquin Jesus Monteferrario | 6-3 6-0 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.