Wimbledon Open champion Petra Kvitova has pulled out of the Qatar Ladies Open because of an unspecified injury.
The second-ranked Czech will miss the tournament that starts Monday.
Tournament organizers say they have no information on Kvitova's injury.
Australian Open champion Victoria Azarenka is the top-seeded player. The field includes defending champion Vera Zvonareva, 2011 finalist Caroline Wozniacki and U.S. Open winner Sam Stosur.
