Tommy Haas defeated Horacio Zeballos 6-3 5-7 6-2 in the Sao Paulo quarter-final on clay. The upset overturned the form book — Horacio Zeballos came in defending last year's round of 32.
Haas T. came through in three sets.
Haas T. and Zeballos H. faced 2 of the same opponents in the last 12 months. Haas T. went 2–0 (100%) against them, Zeballos H. 0–2 (0%).
Only 2 common opponents — too few for any conclusion. Shown without assessment.
Tommy Haas beat Horacio Zeballos 6-3 5-7 6-2. Umpiry, "Tommy Haas vs Horacio Zeballos — Sao Paulo Quarter-final", https://umpiry.com/match/2014-02-24/haas-vs-zeballos-sao-paulo-qf?utm_source=cite (as of 24 February 2014).