From left, Ana Ivanovic, of Serbia, Rafael Nadal, of Spain, Maria Sharapova, of Russia, Roger Federer, of Switzerland, and Aleksandra Wozniak, of Canada, pose for a photo next to a listing of past champions at the BNP Paribas Open tennis tournament, Wednesday, March 11, 2015, in Indian Wells, Calif. (AP Photo/Mark J. Terrill)