Chelsea look likely to be the main contenders for United's Premier League crown, having overtaken Liverpool on a dramatic Saturday afternoon.
Guus Hiddink's side looked set to drop two crucial points against Wigan Athletic after Olivier Kapo had cancelled out John Terry's opener, only for Frank Lampard to convert an injury-time winner at Stamford Bridge.
That result took the Blues ahead of Rafael Benitez's Merseysiders, who slipped to defeat at Middlesbrough. Boro hadn't won for 14 league games, but took the lead when Xabi Alonso scored an own-goal, and Tuncay made sure of the points with a second half strike.
Meanwhile, Arsenal posted a fourth successive