Nikolas Sanchez Izquierdo defeated Zsombor Piros 4-6 7-6 6-2 in the M25 Prostejov 1 quarter-final on clay. The upset overturned the form book — Zsombor Piros came in ranked #114, but Nikolas Sanchez Izquierdo had been the form player, winning 5 of their last 6 on clay.
Sanchez Izquierdo N. came through in three sets.
Nikolas Sanchez Izquierdo beat Zsombor Piros 4-6 7-6(1) 6-2. Umpiry, "Nikolas Sanchez Izquierdo vs Zsombor Piros — M25 Prostejov 1 Quarter-final", https://umpiry.com/match/2021-08-19/izquierdo-vs-piros-m25-prostejov-1-qf?utm_source=cite (as of 19 August 2021).