United shock-started the League Cup semi-final by scoring in the third minute through Marcus Rashford.
But, unfortunately for United, it was ruled out for offside.
Two minutes later, it was City's turn to get a goal ruled out for offside.
This time it was Ilkay Gundogan who did it.
After chances in both directions, including a post shot by City's Keivn De Bruyne, Phil Foden scored in City tonight's third offside goal.
After another couple of penalty situations, the referee blew off for a goalless first half.
A half where Manchester City had a massive ball possession, but otherwise even in goal chances.
Stone's lead shooter
It would eventually be a case that was not ruled out.
And it was Manchester City's John Stones who took care of a free kick return in the best way and made it 1-0 in the 51st minute.
United tried to get a draw but created nothing really dangerous.
Instead, it was City's Fernandinho who extended the lead to 2-0 after receiving a clearance on a corner straight towards him and banging the ball in from distance.
CLIP: Cavani lowered Olsen's Everton in the League Cup (December 24, 2020)
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United beat Robin Olsen's Everton in the league cup.
Photo: Bildbyrån / TT.