Kei Nishikori Pictures
ROTTERDAM, NETHERLANDS - FEBRUARY 16: Kei Nishikori of Japan reacts to a point against Stan Wawrinka of Switzerland in their semi final match during Day 6 of the ABN AMRO World Tennis Tournament at Rotterdam Ahoy on February 16, 2019 in Rotterdam, Netherlands. (Photo by Dean Mouhtaropoulos/Getty Images)