Roger Federer

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Roger Federer, of Switzerland, reacts after winning the first set over Kevin Anderson, of South Africa, in the quarterfinals of the BNP Paribas Open tennis tournament, Thursday, March 13, 2014, in Indian Wells, Calif. (AP Photo/Mark J. Terrill)

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Kevin Anderson, of South Africa, returns a shot to Roger Federer, of Switzerland, during the quarterfinals of the BNP Paribas Open tennis tournament, Thursday, March 13, 2014, in Indian Wells, Calif. (AP Photo/Mark J. Terrill)

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Roger Federer, of Switzerland, serves to Kevin Anderson, of South Africa, during their quarterfinal match at the BNP Paribas Open tennis tournament on Thursday, March 13, 2014, in Indian Wells, Calif. (AP Photo/Mark J. Terrill)