Former Olympic tennis champion Lindsay Davenport has withdrawn from the singles tournament in Beijing
Davenport, who has been struggling with a right knee injury, is still hoping to play doubles with Liezel Huber.
The 32-year-old American has not played a match since Wimbledon in June where she was forced to withdraw in the second round.
Three-times grand slam champion Davenport, who came out of retirement last year after giving birth to her son with the specific intention of competing in Beijing, still hopes to win another medal to go with her gold from Atlanta in 1996.
