Manchester United fought back from a goal down to beat neighbouring title rivals Manchester City 4-2 at Old Trafford on Sunday.
Argentine striker Sergio Aguero opened the scoring eight minutes, but United responded with interest via strikes from Ashley Young, Marouane Fellaini, Juan Mata and Chris Smalling.
Aguero then completed his brace in the 89th minute to add some respectability to the scoreline for the English champions.
Earlier Premier League leaders Chelsea edged struggling QPR 1-0 in a London derby, with Spanish midfielder Cesc Fabregas netting with two minutes to go at Loftus Road Stadium
Jose Mourinho's side, who carry a game in hand on their rivals, end the weekend with 73 points from 31 games - seven points richer than second-placed Arsenal, eight in front of United and 12 ahead of the fourth-placed Citizens. Southampton in fifth spot have 56 points.