Simon Stone
BBC Sport at Etihad Stadium
Manchester City came from behind and Julian Alvarez scored two second-half goals as Pep Guardiola's men began the defence of their Champions League title with a win against Serbian champions Red Star Belgrade.
European Cup winners themselves in 1991, Red Star threatened a famous win when Osman Bukari put them in front at the end of the first-half.
But City took less than 90 seconds to level after the restart as Alvarez raced onto Erling Haaland's return pass, rounded Red Star keeper Omri Glazer with a superb piece of deception and squeezed the ball home from a tight angle while still running at full speed.