Juan Martin del Potro, from Argentina, hits the ball during a finals match against John Isner, of the U.S., at the Citi Open tennis tournament, Sunday, Aug. 4, 2013 in Washington. (AP Photo/Alex Brandon)
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Juan Martin del Potro, from Argentina, hits the ball during a finals match against John Isner, of the U.S., at the Citi Open tennis tournament, Sunday, Aug. 4, 2013 in Washington. (AP Photo/Alex Brandon)
