Man Utd 4-2 Man City.
Manchester United produced a display of maturity and came out as victors in the 169th Manchester derby as they turned the game around in ruthless fashion.
While the City players decided that kicking their rivals was the best route to a win, United kept their heads and proved that they have a new found resilience and a collective team spirit about them.
City had won the last four derby games but have been in free fall over the last two months and were ripe for the picking by United.
Louis van Gaal made only one change from last week's victory over Aston Villa as Chris Smalling recovered from his illness and replaced Marcos Rojo in the centre of defence.
Manchester United: De Gea, Valencia, Smalling, Jones, Blind, Carrick, Fellaini, Herrera, Mata, Young and Rooney.
Subs: Valdes, Rafael, Rojo, McNair, Januzaj, Di Maria and Falcao.
Once again no starting place for Di Maria or Falcao as Van Gaal decided not to change a winning formula.
City kicked off the match in front of a full and very vocal Old Trafford crowd.
In the first minute, Clichy went hard into Mata on the touchline and luckily there was no serious damage, but it showed City's intent. From the resulting free-kick Rooney was almost in on goal but keeper Hart rushed off his line to smother the ball.
Manchester United are the form team so it was a surprise to see the Red Devils make the most-nervy start of the two under the rain at Old Trafford.
A long ball over the top of United's defence saw Aguero through on goal and as he bore down David de Gea produced an excellent stop to thwart the Argentinian and stop a certain goal.
However, City continued to press and in the seventh minute they cut the United defence open too easily. David Silva had all the time in the world to pick out Aguero who tapped the ball into an empty net.
First blood City. The most important question for van Gaal had to be where were his defenders?
A bad start from the home side but early enough to rectify the situation.
In the first ten minutes, United struggled to get a hold of the ball and City were finding it all too easy to control the play.
12 minutes in and Young was brought down as he attacked down the right. The free-kick from Mata came to nothing, but it was a sign that United were getting their game together.
Two minutes later and United scored to level the match. It was Ashley Young who came up with the crucial equaliser, but it was started from a David de Gea clearance.
As the keeper hoofed the ball down the field it was headed on by Fellaini and collected on the left by Ander Hererra who whipped over a cross that the City defence failed to clear under pressure. Young was in the right place and the winger reacted first to spin and stab the ball home.
1-1 and game on.
What a lively start to the game as both teams scored goals from defensive mistakes. I have never seen de Gea have to come outside his box to clear the ball as much as he had to in that mad twenty minute spell.
Milner received the first booking of the match on 24 minutes after he hauled back Herrera. Young took the resulting free-kick and picked out Fellaini inside the area, unfortunately, his header down found no one.
In the 27th minute, United took a well-deserved lead. The crowd witnessed great skill from Mata in the middle of the park as he brilliantly made room for himself and sprayed a pass to the left.
The ball came to Young who produced a back heel to set up Blind who returned the pass to Young allowing the winger the time needed to deliver a delightful cross to the far post where Fellaini powered home a header to put the Red Devils ahead.
A great team goal that showed the confidence pulsing through side and one that lifted the roof off Old Trafford.
Thirty minutes in and United had gained control of the match but City still threatened up front from the running of Aguero.
On the half hour, there was yet another booking for City as Silva brought down Mata. United's two Spaniards were certainly getting worked over in the first half.
David de Gea had to be on his toes as his defenders continually made him rush out and clear his lines after they continued to leave him unguarded at the back.