Marcus Rashford became the youngest scorer in the history of this derby in the Premier League as his winner gave Manchester United a victory that moved them to within one point of fourth-placed Manchester City.
Rashford embarrassed hapless City defender Martin Demichelis to score the game’s only goal in the 16th minute, taking his tally to five goals in eight first-team appearances and making him the youngest ever Manchester derby goalscorer at the age of 18 years and 141 days.
Victory took Louis van Gaal’s side to within a point of fourth-place City, stemming a damaging run of four games without victory and creating hope that United may yet finish a testing season by claiming a Champions League berth.
City’s grip on fourth place is also at threat from West Ham United and although they retain a game in hand on the teams above them, they now trail leaders Leicester City by a massive 15 points.
Compounding a miserable last derby for outgoing City manager Manuel Pellegrini, the hosts lost both goalkeeper Joe Hart and winger Raheem Sterling to injury.
With Vincent Kompany and Nicolas Otamendi having both succumbed to injury against Dynamo Kiev on Tuesday, it has been a week that Pellegrini may come to rue when his side cross paths with Paris Saint-Germain in the Champions League next month.
Buoyed by their historic Champions League success against Dynamo, City had attacked the game with purpose and twice went close to taking the lead through Jesus Navas in the early stages.
Fernandinho also headed over the bar from a Navas corner, but United’s pace on the break gave them a ready outlet and in the 16th minute they struck.
Juan Mata fed Rashford on the edge of the box and the youngster planted Demichelis on his backside before tucking a shot past Hart to claim his own piece of derby history.
Shorn of captain Kompany and Otamendi, City were always likely to be vulnerable in central defence and Hart was called into action moments later to beat away a shot from Anthony Martial.
At the other end, Demichelis got his head to David Silva’s free-kick, but the ball passed the wrong side of David de Gea’s left-hand post.