MASON, OHIO - AUGUST 18: Karen Khachanov of Russia serves to Felix Auger-Aliassime of Canada during the Western & Southern Open at Lindner Family Tennis Center on August 18, 2021 in Mason, Ohio. (Photo by Matthew Stockman/Getty Images)
MASON, OHIO - AUGUST 18: Karen Khachanov of Russia serves to Felix Auger-Aliassime of Canada during the Western & Southern Open at Lindner Family Tennis Center on August 18, 2021 in Mason, Ohio. (Photo by Matthew Stockman/Getty Images)