Williams sisters pull out of Wimbledon doubles after Serena injury

Serena Williams pulled out of her Wimbledon doubles campaign alongside sister Venus after sustaining a knee injury during her opening-round singles defeat, stripping the Saturday draw of a major headline act on American Independence Day.

Serena announced the news on social media alongside a video of herself limping with strapping on her right leg, and pictures of large syringes of fluid drained from her knee....