Before Tuesday's second round doubles match at Wimbledon, Serena Williams was struggling to hit balls, seemed disoriented, and even started crying.
Which caused a lot of commotion on Twitter:
Although no one is totally sure what happened, on Saturday, after losing to Alize Cornet, Serena Williams said in a post-game interview that "I suck right now at doubles. I told Venus the other day I don't even want to play because I'm so bad right now. She should get a new partner."
Update — July 1, 12:55 p.m. ET: According to SI Tennis, the official reason for Serena Williams' exit was "viral illness."