Jack Sock returns the ball to Milos Raonic, of Canada, during the Sony Open tennis tournament in Key Biscayne, Fla., Saturday, March 22, 2014. (AP Photo/J Pat Carter)

Key Biscayne Tennis

Jack Sock returns the ball to Milos Raonic, of Canada, during the Sony Open tennis tournament in Key Biscayne, Fla., Saturday, March 22, 2014. (AP Photo/J Pat Carter)

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