Serena Williams returns the ball to Ana Ivanovic, from Serbia, during the second set of their match in the Bank of the West Classic tennis tournament in Stanford, Calif., Friday, Aug. 1, 2014. Williams won 2-6, 6-3, 7-5. (AP Photo/Jeff Chiu)

Stanford Tennis

Serena Williams returns the ball to Ana Ivanovic, from Serbia, during the second set of their match in the Bank of the West Classic tennis tournament in Stanford, Calif., Friday, Aug. 1, 2014. Williams won 2-6, 6-3, 7-5. (AP Photo/Jeff Chiu)

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