Roger Federer, of Switzerland, serves to Stanislas Wawrinka, of Switzerland, during their match at the BNP Paribas Open tennis tournament, Wednesday, March 13, 2013, in Indian Wells, Calif. (AP Photo/Mark J. Terrill)

Associated Press
Roger Federer, of Switzerland, serves to Stanislas Wawrinka, of Switzerland, during their match at the BNP Paribas Open tennis tournament, Wednesday, March 13, 2013, in Indian Wells, Calif. (AP Photo/Mark J. Terrill)
Roger Federer, of Switzerland, serves to Stanislas Wawrinka, of Switzerland, during their match at the BNP Paribas Open tennis tournament, Wednesday, March 13, 2013, in Indian Wells, Calif. (AP Photo/Mark J. Terrill)
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