Matias Sborowitz defeated Guillermo Rivera Aranguiz 4-6 7-5 6-3 in the Chile F14 round of 16 on clay. The upset overturned the form book — Guillermo Rivera Aranguiz came in leading the head-to-head 1–0, but Matias Sborowitz had been the form player, winning 5 of their last 10 on clay. Matias Sborowitz claimed a first win over Guillermo Rivera Aranguiz in two meetings, levelling the head-to-head at 1–1.
Sborowitz M. came through in three sets.
Matias Sborowitz beat Guillermo Rivera Aranguiz 4-6 7-5 6-3. Umpiry, "Matias Sborowitz vs Guillermo Rivera Aranguiz — Chile F14 Round of 16", https://umpiry.com/match/2011-11-21/aranguiz-vs-sborowitz-chile-f14-r16?utm_source=cite (as of 21 November 2011).