Louis van Gaal's Red Devils defeated City 1-0 at Etihad Stadium on Sunday to move within four points of Manuel Pellegrini's men.
Teenage striker Marcus Rashford scored the only goal of the contest with a lovely finish in the 16th minute which painted the Manc red.
Below are the Twitter reactions of the United players who contributed to the triumph, some who watched on, plus a couple of tributes to young gun Rashford from some past Old Trafford greats.
Manchester is still red Manchester sigue siendo roja #mufcpic.twitter.com/XSEGnpEuaU
— David De Gea (@D_DeGea) March 20, 2016
Great win ! Manchester is RED! #mufcpic.twitter.com/zAbsmDX5kf
— Morgan Schneiderlin (@SchneiderlinMo4) March 20, 2016
— Adnan Januzaj (@adnanjanuzaj) March 20, 2016
Important derby win for us after an intense match against City. #mufcpic.twitter.com/1E0pGC2O7u
— Basti Schweinsteiger (@BSchweinsteiger) March 20, 2016
Great win, unbelievable effort from start to finish. The city is
— Ashley Young (@youngy18) March 20, 2016
Manchester is RED , Massive team performance!! #MUFCpic.twitter.com/Ux4xwSHLWG
— Daley Blind (@BlindDaley) March 20, 2016
No better feeling!! Manchester is RED Marcus producing again @ManUtd#muf
— Chris Smalling (@ChrisSmalling) March 20, 2016
Very very happy today. @ManUtdpic.twitter.com/euVdbD0fkK
— Juan Mata García (@juanmata8) March 20, 2016
Manchester is RED pic.twitter.com/lud43UIj31
— Matteo Darmian (@DarmianOfficial) March 20, 2016
What a present! three points on my birthday! Thank you everyone for your support pic.twitter.com/GeBe4Avmdx
— Marcos Rojo (@marcosrojo5) March 20, 2016
Great performance of the team today and great goal Marcus pic.twitter.com/gV3LLByOt0
— Anthony Martial (@AnthonyMartial) March 20, 2016
We have obtained three important points the fans deserve .We have obtained three important points the fans deserve pic.twitter.com/FdiN4ToUUd
— Antonio Valencia (@anto_v25) March 20, 2016
good win brilliant goal bro @marcusrashfordpic.twitter.com/8JvSS7EFk2
— Timothy fosu-mensah (@timboo95) March 20, 2016
The boy Rashford!!!!
— Andrew Cole (@vancole9) March 20, 2016
If you are good enough you are old enough.... #Rashford
— Rio Ferdinand (@rioferdy5) March 20, 2016