Vladimir Obradovic defeated Andrea Collarini 6-7 7-6 6-4 in the USA F4 round of 16 on clay. The result followed the form book — Vladimir Obradovic came in leading the head-to-head 1–0. Vladimir Obradovic extended the head-to-head to 2–0.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2011-03-07 | USA F7 | R32 | hard | Vladimir Obradovic | 6-3 2-6 7-6(7) |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.