Denis Petak defeated Marlon Vankan 3-6 6-2 6-1 in the M15 Alkmaar 1 round of 32 on clay. The upset overturned the form book — Marlon Vankan came in ranked #620, leading the head-to-head 1–0. Denis Petak claimed a first win over Marlon Vankan in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2025-08-07 | M15 Slovenska Bistrica 1 | R16 | clay | Marlon Vankan | 7-5 6-2 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.