Serbia

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Novak Djokovic, of Serbia, hits to Julien Benneteau, of France, in their quarterfinal match at the BNP Paribas Open tennis tournament on Friday, March 14, 2014, in Indian Wells, Calif. (AP Photo/Mark J. Terrill)

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Novak Djokovic, of Serbia, returns a shot to Marin Cilic, of Croatia, during their match at the BNP Paribas Open tennis tournament, Wednesday, March 12, 2014, in Indian Wells, Calif. (AP Photo/Mark J. Terrill)

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Marin Cilic, of Croatia, returns a shot to Novak Djokovic, of Serbia, during their match at the BNP Paribas Open tennis tournament, Wednesday, March 12, 2014, in Indian Wells, Calif. (AP Photo/Mark J. Terrill)

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Jelena Jankovic, of Serbia, returns a shot to Agnieszka Radwanska, of Poland, during their 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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Agnieszka Radwanska, of Poland, returns a shot to Jelena Jankovic, of Serbia, during their match at the BNP Paribas Open tennis tournament, Wednesday, March 12, 2014, in Indian Wells, Calif. (AP Photo/Mark J. Terrill)