The second matchday of the Champions League began with a bang. Simone Inzaghi’s Inter cruised to a 4-0 victory over Red Star Belgrade at San Siro, securing their first European win of the season. Calhanoglu opened the scoring from a free kick, Arnautovic doubled the lead in the second half, Lautaro Martinez added a third, and Taremi scored his first goal for the Nerazzurri from the penalty spot.
Milan fought hard but came up short against Bayer Leverkusen, who secured their second Champions League win thanks to a goal from Boniface. The Rossoneri had a strong second half, coming close to scoring with Morata and appealing for a penalty on Loftus-Cheek in the final minutes, which the referee did not award.
In the early kickoffs at 18:45, Brest stunned Salzburg with a resounding 4-0 win in Austria, securing their second win in as many games. It ended 1-1 between Stuttgart and Sparta Prague, with all the action in the first half: the Germans took the lead, but the Czechs quickly equalized to secure the final result.
Barcelona bounced back from their opening defeat to Monaco with a 5-0 thrashing of Young Boys, led by a hat-trick from Robert Lewandowski. Manchester City also enjoyed a dominant 4-0 win in Slovakia against Slovan Bratislava, with goals from Gundogan, Foden, Haaland—his 42nd in 41 Champions League appearances—and McAtee, who marked his debut in style.
Borussia Dortmund went even further, putting seven past an overwhelmed Celtic. Adeyemi was the standout player with a hat-trick, while Emre Can and Guirassy (who scored twice in the second half) contributed to a 5-1 halftime lead. Nmecha added the final goal for Dortmund, with Maeda scoring the consolation goal for Celtic.
At the Emirates Stadium, two mistakes from Donnarumma condemned PSG to a 2-0 defeat against Arsenal, with goals from Havertz and Saka. Meanwhile, at the Philips Arena in Eindhoven, PSV and Sporting Lisbon played out a 1-1 draw. The Dutch side went ahead through Schouten, but after missing several chances to double their lead, they conceded a late equalizer to Braganca.