Jelena Jankovic, of Serbia, hits to Caroline Wozniacki, of Denmark, during their fourth round match at the BNP Paribas Open tennis tournament, Tuesday, March 11, 2014, in Indian Wells, Calif. (AP Photo/Mark J. Terrill)

Jelena Jankovic, of Serbia, hits to Caroline Wozniacki, of Denmark, during their fourth round match at the BNP Paribas Open tennis tournament, Tuesday, March 11, 2014, in Indian Wells, Calif. (AP Photo/Mark J. Terrill)