Scotland star Scott McTominay stepped off the bench to ensure Manchester United did the double over rivals Manchester City.
The midfielder struck the second late on after a mistake from Ederson, who will be criticised for his part in both Manchester United goals.
The Manchester City goalkeeper allowed Anthony Martial's shot in the first half to slip underneath him before throwing the ball straight to McTominay to score from 30 yards.
Pep Guardiola was left baffled by Ederson's mistakes as United claimed their first league double over City since 2009/10. City were without playmaker Kevin De Bruyne for their derby against rivals Manchester United at Old Trafford.With the second leg of their Champions League tie against Real Madrid coming
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