Stefan Kostic defeated Nikola Lulic 7-6 6-2 in the M25 Belgrade 1 q32 on clay. The result followed the form book — Stefan Kostic came in leading the head-to-head 1–0. Stefan Kostic extended the head-to-head to 2–0.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2025-09-22 | M25 Zlatibor 1 | Q32 | clay | Stefan Kostic | 7-5 6-3 |