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)

Indian Wells Tennis

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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