Nikola Ciric defeated Aleksander Slovic 6-4 5-7 6-4 in the USA F2 qualifying round on clay. The upset overturned the form book — Aleksander Slovic came in leading the head-to-head 4–0. Nikola Ciric claimed a first win over Aleksander Slovic in five meetings, narrowing the head-to-head to 4–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2009-06-08 | Serbia F2 | R16 | clay | Aleksander Slovic | 7-6(2) 6-7(6) 6-1 |
| 2008-08-18 | Serbia F5 | R32 | clay | Aleksander Slovic | 7-6(6) 6-1 |
| 2008-06-23 | Serbia F2 | SF | clay | Aleksander Slovic | 7-5 4-2 |
| 2003-08-11 | Serbia & Montenegro 1 1 | QF | clay | Aleksander Slovic | 6-4 3-6 6-0 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.