Hungarian Challenger Open planned to have four tournaments between 2016 and 2019, Filippo Baldi is the most recent winner.
Aliaksandr Bury
Andreas Siljestrom 2016 2017 2018 2019 Dino Marcan
Tristan-Samuel Weissborn Felix Auger-Aliassime
Nicola Kuhn Kevin Krawietz
Filip Polasek Filippo Baldi
Luca Margaroli 
