Zdenek Kolar defeated Aleksandar Vukic 6-2 6-1 in the Poland F10 round of 16 on clay. The upset overturned the form book — Aleksandar Vukic came in ranked #115.
Kolar Z. took it in straight sets.
Zdenek Kolar beat Aleksandar Vukic 6-2 6-1. Umpiry, "Zdenek Kolar vs Aleksandar Vukic — Poland F10 Round of 16", https://umpiry.com/match/2017-08-21/kolar-vs-vukic-poland-f10-r16?utm_source=cite (as of 21 August 2017).