Unai Emery sent the Gunners out to play in a 3-4-3 formation at the Emirates to bamboozle Ole Gunnar Solskjaer and hand the Norwegian his first defeat in the Premier League since replacing Jose Mourinho in December and his first loss away from Old Trafford.
Pierre-Emerick Aubameyang’s kick took the air out of United and allowed Arsenal to leapfrog them into fourth place, a point behind Tottenham Hotspur.
With eight games to go, just four points separate the four contenders. This result could prove hugely significant.