In a highly anticipated Champions League opener, Real Madrid edged out Inter Milan 2-1 at the Bernabéu. The match saw Kylian Mbappé, who joined Real Madrid in the summer, score the opening goal in the 14th minute after capitalizing on a defensive error by Yann Bisseck. Mbappé had chances to double his tally, but a tackle in the 26th minute and a close-range shot in the 45th minute were thwarted. Inter Milan responded in the 77th minute through a goal by Carlos Augusto, but Real Madrid held on for the win, marking a strong start to their European campaign. In another match, Manchester City claimed a 2-0 victory over Porto, with Erling Haaland netting both goals. His first came in the 47th minute, and he added a second in stoppage time. The match saw tensions rise after a late first-half incident between Manchester City's Marc Guehi and Porto's Gabri Veiga, which led to security personnel being involved during the half-time tunnel. Despite Porto having several scoring opportunities, especially in the rainy second half, Manchester City managed to secure the win. Enzo Maresca, the newly appointed manager of Manchester City, praised the result, emphasizing its importance for his new project. The victory was a solid start to his European campaign, even though the match ended with some late friction between the teams. Other notable results from the opening matches included Borussia Dortmund's 3-2 victory over Villarreal, with Serhou Guirassy scoring twice. Meanwhile, Kylian Mbappé added to his goal tally with his first of the night in Real Madrid's win over Inter Milan. Lille fell to a 2-3 defeat against Betis after initially taking the lead, and Aston Villa secured a 3-2 win over Club Bruges. AEK Athens completed the day's action with a 1-0 victory over LASK.