Stefanos Tsitsipas topped Karen Khachanov in the ABN AMRO World Tennis Tournament quarterfinals in Rotterdam, The Netherlands. EPA-EFE/KOEN SUYKKaren Khachanov was up a break in the final set, but could not close Stefanos Tsitsipas in the Rotterdam quarterfinals. EPA-EFE/KOEN SUYKABN AMRO World Tennis Tournament Director Richard Krajicek (left) has showed his creativity running the event without fans. Photo credit: ABN AMRO World Tennis Tournament FacebookKei Nishikori lost in two tight tie break sets to Borna Coric. EPA-EFE/KOEN SUYKUS Open quarterfinalist Borna Coric improved to 6-2 on the season.French qualifier Jeremy Chardy saved two match points winning his opener and pushed fourth-seeded Andrey Rublev to three sets in the quarterfinals. EPA-EFE/KOEN SUYKAndrey Rublev topped Jeremy Chardy 7-6, 6-7, 6-4 improving his 2021 record to 11-1 scoring his 18th straight ATP 500-level win. EPA-EFE/KOEN SUYKAmerican Tommy Paul battled Hungarian qualifier Marton Fucsovics. EPA-EFE/KOEN SUYKFormer Wimbledon champion Richard Krajicek, the long-time ABN AMRO World Tennis Tournament Director. Photo credit: ABN AMRO World Tennis Tournament FacebookStefanos Tsitsipas reacts after winning his quarterfinal match against Karen Khachanov on the fifth day of the ABN AMRO World Tennis Tournament in Rotterdam, The Netherlands. EPA-EFE/KOEN SUYK