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KEY BISCAYNE, FL - MARCH 30: John Isner of the United States shakes hands at the net after his straight sets victory against Juan Martin Del Potro of Argentina in their semifinal match during the Miami Open Presented by Itau at Crandon Park Tennis Center on March 30, 2018 in Key Biscayne, Florida. (Photo by Clive Brunskill/Getty Images)

KEY BISCAYNE, FL - MARCH 30:  John Isner of the United States shakes hands at the net after his straight sets victory against Juan Martin Del Potro of Argentina in their semifinal match  during the Miami Open Presented by Itau at Crandon Park Tennis Center on March 30, 2018 in Key Biscayne, Florida.  (Photo by Clive Brunskill/Getty Images)