Theo Walcott's cool fifth-minute finish from Alexis Sanchez's pass put the Gunners in control at the interval - but the second half brought a familiar painful fate for manager Arsene Wenger and his players.
As at Everton on Tuesday, they were overpowered and the credits were rolling once Leroy Sane ran on to David Silva's pass to beat Petr Cech with Arsenal appealing in vain for offside.
City were on a roll and Arsenal were on the rack, the winner coming 19 minutes from time when Raheem Sterling was the beneficiary of Kevin de Bruyne's brilliant pass to arrow a low finish past Cech at his near post.
It bolstered City's title ambitions, although they are still seven points behind leaders Chelsea and completed a damaging double for Arsenal as they now lie nine points behind Antonio Conte's side.
(BBC)
