Barcelona rode their lucky early on at the Ramon Sanchez Pizjuan as Marc-Andre ter Stegen denied Ivan Rakitic and Youssef En-Nesyri before the visitors struck against the run of play.

Raphinha headed in the rebound after Lewandowski's dinked effort was cleared off the line, but the Poland star didn't need long to get on the scoresheet himself.

Lewandowski controlled a flighted pass from Jules Kounde on his chest and volleyed past Bono for his fifth league goal in four appearances.

Eric Garcia tapped in Barcelona's third five minutes after half-time after Raphinha's cross was nodded across goal by Kounde, who was sold by Sevilla for 50 million euros ($49.8 million) this summer.

Barcelona, who host Viktoria Plzen on Wednesday in the opening round of Champions League group games, are two points behind Madrid -- 2-1 winners over Betis earlier in the day.