Serena Williams, of the United States, returns the ball to Ana Ivanovic, from Serbia, during the first set of their match in the Bank of the West Classic tennis tournament in Stanford, Calif., Friday, Aug. 1, 2014. (AP Photo/Jeff Chiu)

Stanford Tennis

Serena Williams, of the United States, returns the ball to Ana Ivanovic, from Serbia, during the first set of their match in the Bank of the West Classic tennis tournament in Stanford, Calif., Friday, Aug. 1, 2014. (AP Photo/Jeff Chiu)

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