Miljan Zekic defeated Filip Cristian Jianu 6-2 7-5 in the M25 Kursumlijska Banja 2 quarter-final on clay. The upset overturned the form book — Filip Cristian Jianu came in leading the head-to-head 1–0, but Miljan Zekic had been the form player, winning 2 of their last 8 on clay. Miljan Zekic claimed a first win over Filip Cristian Jianu in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2021-01-22 | M15 Cairo 3 | QF | clay | Filip Cristian Jianu | 7-5 2-6 6-4 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.