Stefan Popovic defeated Ergi Kirkin 6-4 6-2 in the M15 Prijedor 1 quarter-final on clay. The upset overturned the form book — Ergi Kirkin came in ranked #602, leading the head-to-head 1–0, but Stefan Popovic had been the form player, winning 5 of their last 8 on clay. Stefan Popovic claimed a first win over Ergi Kirkin in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2023-05-13 | M15 Doboj 1 | QF | clay | Ergi Kirkin | 2-6 6-3 6-4 |
Averages over each player's completed matches in the selected window (17 vs 106). 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