John Isner returns a shot against Mikhail Kukushkin, of Kazakhstan, during their match at the Winston-Salem Open tennis tournament in Winston-Salem, N.C., Wednesday, Aug. 20, 2014. (AP Photo/Chuck Burton)

Winston Salem Open Tennis

John Isner returns a shot against Mikhail Kukushkin, of Kazakhstan, during their match at the Winston-Salem Open tennis tournament in Winston-Salem, N.C., Wednesday, Aug. 20, 2014. (AP Photo/Chuck Burton)

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