Manchester City manager Pep Guardiola said his side had "reached their highest standard" of the season as they claimed a dominant win over Watford to move top of the Premier League for the first time in 2021-22.
Raheem Sterling headed the reigning champions ahead after only four minutes, when free at the back post to meet Phil Foden's excellent cross from the left.
The hosts were repeatedly ripped apart by City's movement, passing and creativity and only a number of saves from goalkeeper Daniel Bachmann kept the score down to one goal in the first 30 minutes.