Jack Sock, of the United States, hits a backhand against Rafael Nadal, of Spain, during a quarterfinal match at the Miami Open tennis tournament, Wednesday, March 29, 2017, in Key Biscayne, Fla. (AP Photo/Mario Houben)
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Jack Sock, of the United States, hits a backhand against Rafael Nadal, of Spain, during a quarterfinal match at the Miami Open tennis tournament, Wednesday, March 29, 2017, in Key Biscayne, Fla. (AP Photo/Mario Houben)
