Pierre-Emerick Aubameyang‘s second-half penalty gave Arsenal their first Premier League away win over Manchester United in 14 years.
Arsenal have struggled for goals of late, but were gifted the chance to win the game by Paul Pogba‘s mistimed lunge on Hector Bellerin and Aubameyang’s first league goal since the opening day of the season moved Mikel Arteta‘s men up to eighth.
The victory also ended a run of 29 games without a win away from home for Arsenal against their ‘big six’ rivals stretching back to January 2015.
United tried to rally but came no closer to an equaliser than when Donny van de Beek‘s cross-shot flicked off Mohamed Elneny and then into the face of goalkeeper Bernd Leno before bouncing to safety off a post.
It was not the greatest contest between two clubs who used to fight it out for the biggest prizes but are now a pale imitation of their former selves.
While Arsenal will be delighted at the deserved victory, this was not the kind of United performance that did justice to the memory of club legend Nobby Stiles, who died on Friday.
On the field, there was precious little to lift the mood at Old Trafford as United again failed to shine on their own patch.
In his 100th game as United manager, Ole Gunnar Solskjaer stuck with the 4-4-2 system that demolished Leipzig in such stunning fashion but that did little to change the end result of this game.
The Gunners now have 12 points and are up to eighth and United remain in 15th on seven points.