KEY BISCAYNE, FL - MARCH 29: Rafael Nadal of Spain looks on during a match against Jack Sock at Crandon Park Tennis Center on March 29, 2017 in Key Biscayne, Florida. (Photo by Rob Foldy/Getty Images)
KEY BISCAYNE, FL - MARCH 29: Rafael Nadal of Spain looks on during a match against Jack Sock at Crandon Park Tennis Center on March 29, 2017 in Key Biscayne, Florida. (Photo by Rob Foldy/Getty Images)