Ashley Young after United's first goal
Manchester United will start 2013 with a seven-point lead at the top of the Premier League table after a hard-earned win over West Bromwich Albion, while city rivals, City will remain second after an impressive 4-3 win over Norwich with 10 men!
At Old Trafford, Gareth McAuley deflected Ashley Young's cross past Ben Foster at rain-lashed Theatre of Dreams; the match only going ahead after a pitch inspection.
Foster tipped a Young effort onto the bar, before West Brom's Gabriel Tamas wasted a great chance.
But United substitute Robin van Persie sealed victory with a curling finish.
And 10-man Manchester City withstood a determined Norwich to win a pulsating game at Carrow Road.
City surged ahead when Edin Dzeko twice slotted home in the first four minutes.
Anthony Pilkington's free-kick gave Norwich hope but, despite City's Samir Nasri being red-carded, Sergio Aguero added a third for the visitors.
Norwich's Russell Martin scored twice either side of a Dzeko shot going in off the post and keeper Mark Bunn as City held on for the victory.
Wigan Athletic moved out of the Premier League relegation zone and above Aston Villa following a ruthless win against their struggling hosts.
Wigan made the perfect start when Ivan Ramis escaped his marker to meet Jean Beausejour's corner with a firm header.
Brett Holman smashed a half-volley against the crossbar as Villa briefly threatened before the interval.
Emmerson Boyce calmly slotted in after a superb one-two with Arouna Kone, who added the third from a tight angle.
In other games, Tottenham beat Sunderland 2-1, Fulham lost at home 2-1 to Swansea, Read beat West Ham 1-0 while Stoke and Southampton were involved in a six goal thriller with the match ending all square.
Sunderland 1 - 2 Tottenham
Aston Villa 0 - 3 Wigan
Fulham 1 - 2 Swansea
Man Utd 2 - 0 West Brom
Norwich 3 - 4 Man City
Reading 1 - 0 West Ham
Stoke 3 - 3 Southampton