Grzegorz Panfil defeated Hans Podlipnik Castillo 6-4 6-1 in the Poland F1 qualifying round on clay. The upset overturned the form book — Hans Podlipnik Castillo came in leading the head-to-head 2–1. That levelled the head-to-head at 2–2.
Panfil G. took it in straight sets.
Grzegorz Panfil beat Hans Podlipnik Castillo 6-4 6-1. Umpiry, "Grzegorz Panfil vs Hans Podlipnik Castillo — Poland F1 Qualifying Round", https://umpiry.com/match/2011-05-16/castillo-vs-panfil-poland-f1-qf?utm_source=cite (as of 16 May 2011).