Follow Daily Mail Sport's live blog for the latest score, team news and updates as Manchester United host Arsenal at Old Trafford in the Premier League with Ian Ladyman, Riath Al-Samarrai and Nathan Salt reporting from the ground.
The title hopefuls really had to earn that because they were put under so much pressure, and their defence managed to hold out for a famous win.
Manchester United can take so many positives from that game, but ultimately, they start the season with a defeat.
Kai Havertz does brilliantly to dig the ball out of the corner and find Martin Odegaard, who plays a lovely little pass into Bukayo Saka.