Indian Wells, CA (Sports Network) - Angelique Kerber has advanced to the semifinals of the BNP Paribas Open after quarterfinal opponent Samantha Stosur withdrew because of a right calf injury.
The fourth-seeded Kerber will next play the winner of Thursday's other scheduled quarterfinal between top-seeded Victoria Azarenka and former world No. 1 Caroline Wozniacki.
Kerber will play in her second semifinal of 2013, having lost to Dominika Cibulkova in the Sydney semis back in January.
Maria Sharapova and Maria Kirilenko have already advanced to the final four, winning quarterfinal matches on Wednesday. Sharapova, the 2006 Indian Wells champ and last year's runner-up to Azarenka, topped Sara Errani in straight sets, while Kirilenko dumped fifth-seeded Czech Petra Kvitova in three.
This Premier Mandatory WTA event will pay its newest champion $1 million.