Juan Monaco defeated Albert Montanes 3-6 6-1 6-1 in the Vina del Mar quarter-final on clay. The upset overturned the form book — Albert Montanes came in leading the head-to-head 2–0. Juan Monaco claimed a first win over Albert Montanes in three meetings, narrowing the head-to-head to 2–1.
Monaco J. came through in three sets.
Monaco J. and Montanes A. faced 6 of the same opponents in the last 12 months. Monaco J. went 5–2 (71%) against them, Montanes A. 3–6 (33%). Monaco J. came out clearly better against 4 of 6 comparable opponents, Montanes A. against 1 — though 1 of those edges carries caveats (lower-tier event).
Juan Monaco beat Albert Montanes 3-6 6-1 6-1. Umpiry, "Juan Monaco vs Albert Montanes — Vina del Mar Quarter-final", https://umpiry.com/match/2012-02-03/monaco-vs-montanes-vina-del-mar-qf?utm_source=cite (as of 3 February 2012).