Steve Johnson, of the United States, returns the ball to Ivo Karlovic, of Croatia, at the Citi Open tennis tournament, Thursday, July 31, 2014, in Washington. (AP Photo/Luis M. Alvarez)
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Steve Johnson, of the United States, returns the ball to Ivo Karlovic, of Croatia, at the Citi Open tennis tournament, Thursday, July 31, 2014, in Washington. (AP Photo/Luis M. Alvarez)
