Milos Raonic, of Canada, returns the ball to Lleyton Hewitt, of Australia, at the Citi Open tennis tournament, Thursday, July 31, 2014, in Washington. (AP Photo/Luis M. Alvarez)

Citi Open Tennis

Milos Raonic, of Canada, returns the ball to Lleyton Hewitt, of Australia, at the Citi Open tennis tournament, Thursday, July 31, 2014, in Washington. (AP Photo/Luis M. Alvarez)

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