Champions League roundup: Dortmund hit 7, while Barcelona, Manchester City, and Arsenal clinch wins

Karim Adeyemi scored a first-half hat trick as Borussia Dortmund crushed Celtic 7-1 in the revamped Champions League. Barcelona and Manchester City also secured dominant wins. Arsenal triumphed over Paris Saint-Germain, while other notable victories included Inter Milan, Brest, and Bayer Leverkusen.