Serena's Knee Spoils Williams Sisters' Wimbledon Reunion

In a sad twist at Wimbledon, Serena Williams had to withdraw from doubles, leaving her sister Venus in a tough spot once again. After a grueling singles match, Serena's knee just couldn't keep up. Fans were buzzing for the sisters' big reunion, but now they’ll have to hold their horses a bit longer. Talk about a bummer!