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This is, without a doubt, the most important game of the English season so far.
In fact, it may well now be the most important Manchester Derby of all time.
If United pull off an upset and take home the spoils, then with just two matches left, City will trail by a whopping six points—a practically impossible margin to drag back.
However, a win for City lifts them back to the top of the league on goal difference, putting the outcome of the title very much in their hands.
A draw is definitely a more favourable result for United that their rivals—maintaining that three-point gap with just two fixtures left.
After the 6-1 demolishing of United at their home in October it would be easy to say that City are expected to win this match.
However, thinking back to Paul Scholes' dramatic return in the 3-2 FA Cup victory at Eastlands, it's far from impossible for United to get something out of this match.
After eight months of blood, sweat and tears, it quite literally all comes down to this Sunday.
Will United maintain their dominance of the English top flight?
Or will City show that they aren't just a load of talk and money, and end that 40-year drought that plagues Manchester's blue half.
In six days, we will find out.