Petr Hajek advanced when Michal Marko retired 3-6 6-0 4-0 in the Slovakia F4 qualifying round of 32.
Hajek P. advanced when Marko M. retired.
Petr Hajek beat Michal Marko 3-6 6-0 4-0 after Michal Marko retired. Umpiry, "Petr Hajek vs Michal Marko — Slovakia F4 Qualifying Round of 32", https://umpiry.com/match/2016-08-15/hajek-vs-marko-slovakia-f4-q32?utm_source=cite (as of 15 August 2016).