Serena Williams will not add another Wimbledon trophy to her collection this year ... she just withdrew from the tournament due to a leg injury -- and her exit was VERY emotional.
Williams was competing in her first-round match in London against Aliaksandra Sasnovich ... but at one point during the contest, she slipped and injured her leg.
Serena got it all checked out by trainers ... and tried to continue -- but the injury became too much, and she eventually crumpled to the grass in extreme pain.