John Isner hits the ball during his match against Alex Kuznetsov at the Citi Open tennis tournament, Wednesday, July 31, 2013, in Washington. Isner won 7-6 (2), 7-6 (4). (AP Photo/Alex Brandon)
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John Isner hits the ball during his match against Alex Kuznetsov at the Citi Open tennis tournament, Wednesday, July 31, 2013, in Washington. Isner won 7-6 (2), 7-6 (4). (AP Photo/Alex Brandon)
