Borna Coric and Marton Fucsovics completed the quarter-finals line-up at the ABN Amro World Tennis Tournament following respective identical 6-3 6-2 victories in Rotterdam.
Coric eased past Serb Dusan Lajovic, who began his campaign with victory over top seed Daniil Medvedev as the Croatian world number 26 set up a match with resurgent Japanese star Kei Nishikori.
Meanwhile, Fucsovics of Hungary dispatched Spaniard Alejandro Davidovich Fokina and will next face unseeded American Tommy Paul for a place in the semis.