Juan Martin del Potro, of Argentina, lifts the glasses of linesman Marcos Cook during his match against Andy Murray, of Great Britain, at the BNP Paribas Open tennis tournament, Friday, March 15, 2013, in Indian Wells, Calif. (AP Photo/Mark J. Terrill)

Associated Press
Juan Martin del Potro, of Argentina, lifts the glasses of linesman Marcos Cook during his match against Andy Murray, of Great Britain, at the BNP Paribas Open tennis tournament, Friday, March 15, 2013, in Indian Wells, Calif. (AP Photo/Mark J. Terrill)
Juan Martin del Potro, of Argentina, lifts the glasses of linesman Marcos Cook during his match against Andy Murray, of Great Britain, at the BNP Paribas Open tennis tournament, Friday, March 15, 2013, in Indian Wells, Calif. (AP Photo/Mark J. Terrill)
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