#1 Raheem Sterling

Yes, Guardiola has improved him leaps and bound this season, but today's derby will go down easily as one of Raheem Sterling's worst ever outings.
He was lively in the first half and caused Ashley Young a bit of trouble but when presented with two great opportunities to put City 3-0 up, he sent both crashing into the crowd; two shocking misses from the player which if gone in would've resulted in a very different end to the story.
Furthermore, when Otamendi directed a header from a corner towards the goal, he stretched his leg to make contact with the ball to direct it towards the post and De Gea would subsequently clear it away for a corner. The header looked to have beaten Spain's No. 1 and perhaps there was no need for Sterling to get in on the action.
A night to forget for the player and one he will be having nightmares of at least until City get their hands on the title, which still seems inevitable.