Aleksandra Wozniak, of Canada, returns a shot to Li Na, of China, at the BNP Paribas Open tennis tournament, Tuesday, March 11, 2014, in Indian Wells, Calif. (AP Photo/Mark J. Terrill)
Li Na, of China, returns a shot to Aleksandra Wozniak, of Canada, at the BNP Paribas Open tennis tournament, Tuesday, March 11, 2014, in Indian Wells, Calif. (AP Photo/Mark J. Terrill)
Karolina Pliskova, of the Czech Republic, returns a volley by Li Na, of China, during a third round match at the BNP Paribas Open tennis tournament, Monday, March 10, 2014 in Indian Wells, Calif. (AP Photo/Mark J. Terrill)
Karolina Pliskova, of the Czech Republic, returns a volley by Li Na, of China, during a third round match at the BNP Paribas Open tennis tournament, Monday, March 10, 2014 in Indian Wells, Calif. (AP Photo/Mark J. Terrill)
Li Na, of China, returns a volley by Karolina Pliskova, of the Czech Republic, during a third round match at the BNP Paribas Open tennis tournament, Monday, March 10, 2014 in Indian Wells, Calif. (AP Photo/Mark J. Terrill)
Li Na, of China, returns a volley by Karolina Pliskova, of the Czech Republic, during a third round match at the BNP Paribas Open tennis tournament, Monday, March 10, 2014 in Indian Wells, Calif. (AP Photo/Mark J. Terrill)