Chelsea had two players sent off as Manchester City ended the English Premier League leader’s 38-match unbeaten home run by winning 4-2 on Saturday.
Julian Belletti and Michael Ballack both saw red as Chelsea missed a chance to extend its one-point lead over defending champion Manchester United with 10 matches to go.
After Frank Lampard fired Chelsea ahead, Carlos Tevez and Craig Bellamy each scored twice for City.
Lampard scored another in the 90th minute from the penalty spot, but it couldn’t prevent Chelsea losing for the first time in all competitions at Stamford Bridge since November 2008.
By completing its first league double over Chelsea since 1957, City moved back into fourth place and relieved the pressure on manager Roberto Mancini, who had won just four of his last 11 games before prevailing in west London.