Arsenal climbed into the Champions League places with an entertaining victory over lowly Watford in a game with five quality goals.
The Hornets, who remain in the relegation zone, thought they had taken the lead within the first 20 seconds as Emmanuel Dennis slotted home but he was offside.
Martin Odegaard put Arsenal ahead not long afterwards after flicking the ball into the path of Bukayo Saka and then running into the centre to slot in Saka's cross.
Watford levelled with the best individual goal of the game, Cucho Hernandez's acrobatic flying volley from Kiko Femenia's cross.