Barcelona made it six wins out of six in La Liga with victory at Catalan neighbours Girona.
Barca's first two goals came from own goals by the hosts, who are in their first La Liga season.
Luis Suarez smashed home the third after latching on to a Sergi Roberto long ball, BBC reports.
Girona, who are co-owned by Manchester City, played five City loanees in the game, with Brazilian midfielder Douglas Luiz impressive in attacking positions.
Pablo Maffeo, in his third season on loan, successfully man-marked Barca's Lionel Messi, who had scored 11 goals in his previous five games, including four against Eibar on Tuesday.