Up until Saturday, Jose Mourinho was unbeaten in the league at Stamford Bridge, a run that extended 77 games since August 2004. Not many people would have bet on Sunderland—the worst team in the league by position—to end that streak, but that's exactly what happened.
Samuel Eto'o put the Blues ahead after 12 minutes, but Connor Wickham bagged his third goal in two games to equalise six minutes later.
The game stayed even until the 82nd minute, when referee Mike Dean judged Cesar Azpilicueta to have brought U.S. international Jozy Altidore down in the box. Fabio Borini converted the controversial penalty from the spot, gifting Sunderland an unlikely three points and allowing his parent club, Liverpool, to open up a lead at the top of the Premier League.
Sunderland have now taken four points from two consecutive away trips to Manchester City and Chelsea, giving their survival hopes a huge boost.
Mourinho, who had avoided media duties before the game, was terse after the final whistle, simply offering a highly sarcastic "congratulations" to Dean and Premier League head of referees Mike Riley, with whom "The Special One" has already butted heads this season.
"Mou" was clearly irked by the officials, but the Blues were lucky not to finish the game with 10 men after Ramires raised his hand to Sebastian Larsson.