Agnieszka Radwanska, of Poland, pauses during her finals match against Flavia Pennetta, of Italy, at the BNP Paribas Open tennis tournament, Sunday, March 16, 2014, in Indian Wells, Calif. Radwanska, seeded second, was bothered with a left knee injury during the final. She twice called for the trainer in the second set and had her knee heavily taped. (AP Photo/Mark J. Terrill)

Indian Wells Tennis

Agnieszka Radwanska, of Poland, pauses during her finals match against Flavia Pennetta, of Italy, at the BNP Paribas Open tennis tournament, Sunday, March 16, 2014, in Indian Wells, Calif. Radwanska, seeded second, was bothered with a left knee injury during the final. She twice called for the trainer in the second set and had her knee heavily taped. (AP Photo/Mark J. Terrill)

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