Serbia

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Caroline Wozniacki, of Denmark, reacts to losing a point to Bojana Jovanovski, of Serbia, during a second-round match at the BNP Paribas Open tennis tournament on Friday, March 7, 2014, in Indian Wells, Calif. (AP Photo/Mark J. Terrill)

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Caroline Wozniacki, of Denmark, hits tennis balls into the crowd as the sun sets following her match against Bojana Jovanovski, of Serbia, at the BNP Paribas Open tennis tournament, Friday, March 7, 2014, in Indian Wells, Calif. (AP Photo/Mark J. Terrill)

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Jelena Jankovic, of Serbia, returns a shot to Yvonne Meusburger, of Austria, during their match at the BNP Paribas Open tennis tournament on Friday, March 7, 2014, in Indian Wells, Calif. (AP Photo/Mark J. Terrill)