Manchester City showed their teeth as they travelled to the south coast but it took them 45 minutes and a moment of inspiration from Vincent Kompany to do so.
The oft-missing captain rose highest to meet a corner in the 55th minute to head past Fraser Forster and spark what had up to that point had been a drab affair into an entertaining contest.
Leroy Sane and Sergio Aguero punished Southampton as the hosts pushed for a route back in the game as City showed a ruthless streak not demonstrated often enough this season.
More to follow