Substitute Ferran Torres was among the scorers as Manchester City earned a 3-1 comeback win against Porto in Wednesday's Champions League opener after Luis Diaz's impressive solo strike.
City were eliminated at the quarter-final stage for the third year running last season and their latest attempt at winning the competition got off to a somewhat shaky start at the Etihad Stadium.
Diaz profited from some poor defending to race through and open the scoring but the Portuguese champions were pegged back after Pepe gave away a penalty from which Sergio Aguero converted, ending his longest goalscoring drought of 231 days.