Marcel Zielinski defeated Patrick Zahraj 6-7 6-3 6-0 in the M15 Bad Waltersdorf 1 round of 32 on clay. The upset overturned the form book — Patrick Zahraj came in leading the head-to-head 2–1. Marcel Zielinski narrowed the head-to-head to 2–2.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2024-06-13 | M15 Koszalin 1 | R16 | clay | Patrick Zahraj | 7-5 6-0 |
| 2023-09-08 | M15 Koszalin 1 | QF | clay | Marcel Zielinski | 6-3 7-5 |
| 2023-08-31 | M15 Szczawno 1 | R16 | clay | Patrick Zahraj | 6-3 6-3 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.