Antoine Semenyo and Evanilson were on target for Bournemouth who stunned Manchester City 2-1 as the Premier League champions suffered their first loss of the campaign.
City could have extended the gap over Arsenal to eight points in the league standings but fell flat by an inspired display by the hosts at the Vitality Stadium.
Pep Guardiola's charges were evidently not their usual dominant selves, and went 1-0 down through a Semenyo goal as early as the ninth minute.
Bournemouth doubled their lead in the second half, with Evanilson turning the ball past Ederson in the City net just after the hour mark.
In the 82nd minute, Josko Gvardiol's goal gave the visitors hope of a comeback, as did late attempts from Erling Haaland and Phil Foden.
But neither attacker was able to find the back of the net, and City were dealt their first loss of the season.