Nikola Cacic defeated Danilo Petrovic 7-5 6-4 in the Serbia F9 qualifying round on clay. The upset overturned the form book — Danilo Petrovic came in leading the head-to-head 2–1. Nikola Cacic narrowed the head-to-head to 2–2.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2011-10-17 | Croatia F13 | R32 | clay | Danilo Petrovic | 7-6(3) 6-2 |
| 2011-06-27 | Serbia F3 | R32 | clay | Nikola Cacic | 6-0 6-2 |
| 2011-05-09 | Bosnia & Herzegovina F2 | R16 | clay | Danilo Petrovic | 6-4 7-6(5) |
Averages over each player's completed matches in the selected window (92 vs 200). ATP, WTA & Challenger.
Each player's serve crossed against the other's return, converted to expected hold of serve. Recent completed matches, ATP, WTA & Challenger. About