Stefan Kostic defeated Romeo Hadzimehmedovic 7-5 6-4 in the M15 Kursumlijska Banja 14 round of 32 on clay. The upset overturned the form book — Romeo Hadzimehmedovic came in leading the head-to-head 1–0, but Stefan Kostic had been the form player, winning 6 of their last 10 on clay. Stefan Kostic claimed a first win over Romeo Hadzimehmedovic in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2023-08-29 | M15 Kursumlijska Banja 7 | R32 | clay | Romeo Hadzimehmedovic | 6-4 4-6 6-1 |