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

Jack Sock

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

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