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, levelling the head-to-head at 1–1.
Saez J. came through in three sets.
Juan Carlos Saez beat Joaquin Jesus Monteferrario 3-6 6-1 6-4. Umpiry, "Juan Carlos Saez vs Joaquin Jesus Monteferrario — Chile F9 Round of 16", https://umpiry.com/match/2010-12-13/monteferrario-vs-saez-chile-f9-r16?utm_source=cite (as of 13 December 2010).