Champions League round-up: Dortmund scores 7 while Barcelona, Manchester City and Arsenal all win
Robert Lewandowski got Barcelona off the mark as the Spanish giant eased to a 5-0 home win over Swiss team Young Boys, while his former teammate İlkay Gündoğan got City off to a 4-0 win at Slovan Bratislava. Erling Haaland scored his 42nd goal in his 41st Champions League game.