With the blue half of Manchester coming out on top in a 1-0 victory—courtesy of the above pictured Vincent Kompany—there was a shift in power in the race for the title.
Aside from the obvious result, there were other—perhaps more trivial—things that caught my eye.
Alex Ferguson has somewhat of a reputation for being the master of mind games, but it was the Scotsman himself who appeared to lose his cool with opposition manager Roberto Mancini.
With Ferguson clearly upset at the manner in which his team were performing, and Nigel De Jong being pulled up for a foul on Danny Welbeck, the United manager squared off to Roberto Mancini and a heated exchange took place.
Mancini simply smiled and open and closed his hand, mimicking somebody who was talking too much.
Ferguson was relatively quiet after that and doesn't often lose his cool in such a way.
Manchester United just didn't seem to want the game and rarely ventured forward with any real intent save for a few scattered incursions.
Wayne Rooney cut a forlorn figure up front and United rarely threatened the Manchester City goal with just two shots on target during the game (neither of which troubled Joe Hart).
Alex Ferguson will surely be ruing the dropped points against Everton and the subsequent half-heartedness shown today.
At one point it seemed that Manchester City had blown any title chance they had, but how things change in Premier League football.
City looked sharp from the get go, suggesting they believed that the game was theirs for the taking.
Yaya Toure, Samir Nasri and Sergio Aguero were constant menaces with Gael Clichy showing again why he is preferred to the likes of Alexandar Kolarov.
The blue half of Manchester wanted it more...and they got it.
Whenever a big game like this comes around, you look to your captain for leadership and guidance.
Patrice Evra was disappointing for United. His usual forays down the left wing were restricted largely due to the great performance from Samir Nasri. When the two players inevitably came together, it was Nasri who came off best.
Evra showed his impatience when overstretching for tackles and committing needless fouls.
Vincent Kompany on the other hand will be the player who makes the headlines. The Belgian international rose highest just before half time to score the winning header that kept his club's championship dream alive.
The knock-on effect of Kompany's goal is yet to be understood, but it ought to do wonders for team morale at the training ground tomorrow.
Kompany was superb throughout and led by example.
Both Manchester teams have two matches remaining and six points to play for, so to say the title is decided would be premature.
The victory for City against United certainly puts them in the driving seat. But only perfect results over their next two games will guarantee them a first Premier League trophy.
With a host of celebrities in the crowd at the Etihad Stadium, it was Diego Maradona who stole the show.
The father-in-law of City striker Sergio Aguero got caught up in the celebrations at the end of the game and clearly didn't know the words to the song which he was caught singing.
As always with Maradona, he got 10 out of 10 for effort.
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