Chelsea 2-4 Man City
Manchester City inflicted Chelsea's first home Premier League defeat this season in a game which began with Wayne Bridge refusing John Terry's handshake.
Frank Lampard's low strike put Chelsea ahead but Carlos Tevez equalised after a long ball was not dealt with, before Craig Bellamy shot beyond Hilario.
Tevez scored a penalty after Juliano Belletti saw red for a trip on Gareth Barry before a Bellamy tap-in.
Michael Ballack also saw red and Lampard scored a consolation penalty.
City had failed to score in their previous seven visits to Stamford Bridge, while Chelsea had only conceded eight at home in the Premier League all season.
But those statistics were rendered meaningless on an afternoon of triumph for City coach and former Inter Milan boss Roberto Mancini, who pitted his wits in the Premier League for the first time against ex-AC Milan manager Carlo Ancelotti.
City saw their hopes of silverware this season ended by their FA Cup defeat at Stoke in midweek but they boosted their prospects of a top-four finish by completing the double over Chelsea for the first time since 1957.
With Manchester United not in league action this weekend, victory would have taken Chelsea four points clear at the top of the Premier League.
But it was a disastrous afternoon for Ancelotti, whose side had only dropped points in one previous home game this season, a 3-3 draw with Everton.
What's more, his team lacked discipline after the break and were vulnerable in defence, with Hilario looking particularly suspect.
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Swansea 1 - 0 Peterborough
David Cotterill extended promotion-chasing Swansea City's unbeaten run to 12 games and pushed bottom club Peterborough closer to relegation.
Cotterill struck from the spot after Charlie Lee brought him down.
Nathan Dyer had an effort cleared off the line while keeper Joe Lewis denied Ferrie Bodde and Lee Trundle.
Lee Frecklington put a header wide for the Posh but Swansea's biggest worry was the injuries to midfielder duo Bodde and Darren Pratley.
Bodde was making his return from five months out with a knee problem and the Dutchman's exit after just 28 minutes raised question marks as to whether he was ready to play.
It was the third time in 15 months Bodde has suffered an injury to his left knee. In November 2008 he suffered cruiciate ligament damage and then broke down after eight minutes of his starting return against Sheffield United last September. 606: DEBATE
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The double-blow will add to manager Paulo Sousa's midfield woes with Joe Allen, Andrea Orlandi and Jordi Lopez already sidelined.
But the fourth-placed Swans kept their focus on the job in hand and are seven points off an automatic promotion spot and eight ahead of Sheffield United in seventh.
Peterborough remain 10 points adrift of safety and winless on the road.
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