Roger Federer, of Switzerland, returns a shot to Rafael Nadal, of Spain, during their match at the BNP Paribas Open tennis tournament on Thursday, March 14, 2013, in Indian Wells, Calif. (AP Photo/Mark J. Terrill)

Associated Press
Roger Federer, of Switzerland, returns a shot to Rafael Nadal, of Spain, during their match at the BNP Paribas Open tennis tournament on Thursday, March 14, 2013, in Indian Wells, Calif. (AP Photo/Mark J. Terrill)
Roger Federer, of Switzerland, returns a shot to Rafael Nadal, of Spain, during their match at the BNP Paribas Open tennis tournament on Thursday, March 14, 2013, in Indian Wells, Calif. (AP Photo/Mark J. Terrill)
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