Reiss Nelson’s goal sent Arsenal into the FA Cup fourth round after the hosts withstood a first-half barrage from Championship leaders Leeds.
Leeds dominated before the break, with Patrick Bamford hitting the crossbar in one of United’s 15 first-half efforts.
Arsenal were much improved after the restart and Nelson scrambled home to secure a second consecutive win under new boss Mikel Arteta.
The Gunners will play Bournemouth in the next round later this month.
Arsenal had the majority of the second-half chances, with Alexandre Lacazette clipping the crossbar with a free-kick.
Leeds boss Marcelo Bielsa will see the game as a missed opportunity – especially after their first-half performance – although he can now focus on promotion and ending the club’s 16-year absence from the top flight.
More to follow.