Manchester City climbed back up English football's Premier League table with a dominant 3-0 win at rivals and fallen champions Manchester United, while Arsenal drew 2-2 with visitors Swansea to surely extinguish their title challenge.
City are now just three points behind leaders Chelsea with two games in hand after a superb start at Old Trafford, City striker Edin Dzeko pouncing on Samir Nasri's rebounded shot off the post on the 44 second mark to score the second-fastest opening goal in the history of Manchester derbies.
Dzeko then struck from a corner after half-time for his fifth goal in six derby appearances against United, and City's midfield star Yaya Toure finished the scoring in the 90th minute from just inside the box.
At the Emirates Stadium, Arsenal came from behind over Swansea with two goals in just over a minute, from Lukas Podolski and Olivier Giroud, but a deflected own goal in the 90th minute looks to have cost the Gunners any lingering hopes of winning the Premier League.
Everton won 3-0 at Newcastle United to keep their hopes of European football on track. They're fifth, six points behind Arsenal, who are also six points off Chelsea.