Serena Williams (knee) WDs from Wimbledon doubles
Moderated by Tomas Kauer 
(Photo credit: Susan Mullane-Imagn Images)
Serena Williams withdrew from the doubles draw at Wimbledon on Saturday due to a knee injury.
Williams had received a wild-card entry to play alongside her sister, Venus, but tweaked her knee in her first-round singles loss to Maya Joint on Tuesday. The Australian posted a 6-3, 6-7 (6), 6-3 victory over Williams, 44, who was competing in her first professional sing
