The Reds conceded as Gabriel Jesus sprinted clear from the centre circle, shifted the ball past Evans and bent his shot around Onana to finally kill the contest in the 100th minute.
Kai Havertz, The Gunners big signing from Chelsea failed to convert a golden penalty in the 13th minute.
Marcus Rashford broke the deadlock with a stunning 27th-minute strike – his first goal of the season, but after 35 seconds, Gunners captain Martin Odegaard leveled the gave for Arsenal.
In the 55th minute, Anthony Martial’s shot at the near post was pushed away by Ramsdale and then White stepped up to block Rashford’s drive on the rebound.
Garnacho’s goal was ruled out for a tight offside late into the second half, even when the official kept his flag down.
In injury times, Saka’s cross could not be cleared adequately and Declan Rice hammered it pass Onana to put Arsenal in front.
This is Manchester United second straight defeat in four games and it’s not looking good for them. They seem to be struggling at the moment.
