FLUSHING MEADOW, NY - AUGUST 24: STANISLAS WAWRINKA (SUI) during practice day of the 2018 US Open on August 24, 2018 at Billie Jean King National Tennis Center in Flushing Meadow NY (Photo by Chaz Niell/Icon Sportswire via Getty Images)
FLUSHING MEADOW, NY - AUGUST 24: STANISLAS WAWRINKA (SUI) during practice day of the 2018 US Open on August 24, 2018 at Billie Jean King National Tennis Center in Flushing Meadow NY (Photo by Chaz Niell/Icon Sportswire via Getty Images)