Even if it's still early days in the Premier League season, it's already looking like a two-horse race for the title.
There's nothing but goal difference separating the two Manchester clubs at the top of the table.
Tottenham are their next closest rivals, but the north Londoners sit five points behind the Red Devils and must overcome their poor home form if they're to mount a serious challenge.
Neither City nor United have lost a game. Pep Guardiola's men have only won narrowly on a few occasions against Bournemouth, West Brom, and Chelsea, whereas Jose Mourinho's side have been blowing teams away.
United have scored four goals on six occasions in all competitions - pretty impressive stuff considering they became known as 1-1 merchants last season.
That will delight Mourinho, as he must know this campaign is a big test of his managerial reputation. When he could only manage a sixth-placed finish in his first term at Old Trafford, it was forgivable, as the club were still in a period of transition.
Now he has splashed out on Romelu Lukaku, Nemanja Matic, and Victor Lindelof, he's expected to do much better.
The Manchester Evening News report that before the season started, he was very wary of certain teams costing him the title. However, those sides weren't his old club Chelsea, or City, or even Liverpool.
Mourinho needed to address it
It's claimed that Mourinho feared the 'middle tier' of Premier League clubs, whom he thinks have new potential because TV rights have distributed the top flight's wealth.
That goes some way to explaining why the Portuguese has been so excitable when beating teams like West Ham, Everton, and Southampton. United's critics have hit out at their easy run of fixtures, but it would have been very easy for them to slip up.
The Special One could only watch on as Stoke cost his players two vital points last month, so maybe there is something in his theory.
It will be interesting to see how the 20-time champions of England get on when they do start playing their title rivals, but all they can do in the meantime is put themselves in a position to win it.
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