Marcel Zielinski defeated Stefan Popovic 6-4 6-4 in the M25 Antalya 6 round of 16 on clay. The upset overturned the form book — Stefan Popovic came in leading the head-to-head 1–0. Marcel Zielinski claimed a first win over Stefan Popovic in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2025-11-20 | M25 Antalya 5 | R16 | clay | Stefan Popovic | 6-2 6-4 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.