Striker Alexandre Lacazette scored 21 seconds after coming on as a second-half substitute to give Mikel Arteta's side three points against Brighton.
The Frenchman slotted home Bukayo Saka's ball for his third goal in three games to earn the Gunners their first back-to-back league wins since the start of this campaign.
Read on for the Gooner Fanzine's PLAYER RATINGS
Smith Rowe: 7.5
Maitland-Niles: 7 - Replaced ESR (89)
Ceballos: 7 - On for Saka (81)
Lacazette: 7.5 - Came on for Martnelli (66)