Hyeon Chung Pictures
KEY BISCAYNE, FL - MARCH 28: John Isner of the United States shakes hands at the net after his straight sets victory against Hyeon Chung of Korea in their quarter final match during the Miami Open Presented by Itau at Crandon Park Tennis Center on March 28, 2018 in Key Biscayne, Florida. (Photo by Clive Brunskill/Getty Images)