aguero opened scoring in the 8th minute , tapping in silva 's pinpoint cross .
young levels minutes six minutes later , reacting to a loose ball in the box .
fellaini nods in young 's cross for his sixth of the season in the 28th minute .
mata punished weak city defending to add a breakaway third in the 66th .
an unmarked smalling nodded home young 's free-kick to make it four .
aguero finished zabaleta 's cross to add a his second late on .
vincent kompany 's challenge on daley blind attracted criticism - and a booking - and he was subbed after half-time .
city had won the last four manchester derbies but sank to their fourth defeat in six premier league games .
for united , this was a sixth successive win , and a hugely impressive one .
view all the stats and pitch maps from the game with our match zone .
read : ashley young laughs at manchester city as manchester united silence ` noisy neighbours ' with big derby win .