Ivo Karlovic defeated Donald Young 6-4 6-4 in the Houston qualifying round on clay. The upset overturned the form book — Donald Young came in defending last year's round of 32.
Karlovic I. took it in straight sets.
Karlovic I. and Young D. faced 1 of the same opponent in the last 12 months. Karlovic I. went 1–0 (100%) against them, Young D. 0–1 (0%).
Only 1 common opponent — too few for any conclusion. Shown without assessment.
Ivo Karlovic beat Donald Young 6-4 6-4. Umpiry, "Ivo Karlovic vs Donald Young — Houston Qualifying Round", https://umpiry.com/match/2011-04-04/karlovic-vs-young-houston-qf?utm_source=cite (as of 4 April 2011).