Stanislas Wawrinka, of Switzerland, celebrates after winning a point against Kevin Anderson, of South Africa, during a fourth-round match at the BNP Paribas Open tennis tournament on Wednesday, March 12, 2014, in Indian Wells, Calif. (AP Photo/Mark J. Terrill)

Indian Wells Tennis

Stanislas Wawrinka, of Switzerland, celebrates after winning a point against Kevin Anderson, of South Africa, during a fourth-round match at the BNP Paribas Open tennis tournament on Wednesday, March 12, 2014, in Indian Wells, Calif. (AP Photo/Mark J. Terrill)

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