Kodai Sano, who joined PSV Eindhoven from NEC this summer, made his Champions League debut as a starter in a 1-1 draw with Shakhtar Donetsk. Dutch media gave the 22-year-old midfielder the team's highest rating for his work at both ends of the pitch.
Newly-promoted Como beat RB Leipzig 4-1 in their first-ever Champions League match, with manager Cesc Fàbregas sticking to his high-press, fast-attacking identity rather than sitting back. Argentine playmaker Nico Paz set the tempo from midfield and provided two assists as Baturina, Douvikas and Diao put the game away before the hour mark.
Manchester United marked their long-awaited Champions League return with a comprehensive 4-0 win over Sabah FK at Old Trafford, their first appearance in the competition in 1,003 days. Matheus Cunha opened the scoring before further goals put the game out of reach by half-time, with Martinez adding a fourth after the break to complete a controlled performance.
Bayern Munich crushed Norwegian champions Bodø/Glimt 5-0 at home in their Champions League opener. Jamal Musiala broke the deadlock in the second half on his first start since collapsing twice last month, before Harry Kane, Alphonso Davies and a Michael Olise brace completed the rout after Bodø/Glimt were reduced to ten men.
Lens came from behind to beat Slavia Prague 3-2 away in the Champions League. The match was goalless at half-time and included a red card for a Slavia substitute, before a late Slavia lead was overturned by two stoppage-time goals: Thauvin's header set up by 16-year-old debutant Mesloub, and Ruben Aguilar's 93rd-minute winner.
Fenerbahçe and Roma played out a 1-1 draw in Istanbul in their first ever meeting, both sides marking a return to the Champions League. Bryan Cristante gave Roma a late first-half lead before Archie Brown equalized early in the second half, with Fenerbahçe generating the higher xG across the match.
PSV Eindhoven were held 1-1 at home by Shakhtar Donetsk in their Champions League opener at Philips Stadion. Mendoza put Shakhtar ahead in first-half stoppage time, but Dest levelled just three minutes into the second half with a close-range finish, and neither side found a winner despite chances on both ends.
Arsenal traveled to the Stadio Diego Armando Maradona for their Champions League opener and won 1-0, with Martin Odegaard scoring the only goal in the 75th minute off a Christos Tzolis assist to secure a clean sheet away from home.
PSG demolished Slovan Bratislava 6-1 in their Champions League opener, with new signing Ferran Torres scoring a hat-trick on his club debut, becoming the first PSG player to achieve the feat in that fashion. Ousmane Dembele also added two goals.
Liverpool fell behind early at Anfield in their Champions League opener but goals from Dominik Szoboszlai and Alexis Mac Allister turned the game around, beating a defensively set Atletico Madrid 2-1.
Paris Saint-Germain routed Slovan Bratislava 6-1 at home to begin the defence of their Champions League title. Summer signing Ferran Torres scored a hat-trick on his first appearance in the competition, with Ousmane Dembele adding two goals and Fabian Ruiz also getting on the scoresheet. Suleiman Camara scored Slovan Bratislava's only reply.
Liverpool overturned an early deficit to beat Atletico Madrid 2-1 at Anfield in their Champions League opener. Dominik Szoboszlai equalized just before half-time after Liverpool had fallen behind, and Alexis Mac Allister struck the winner in the second half. Atletico pushed until the final whistle but could not find a second goal of their own.
Arsenal won 1-0 away at Napoli's Stadio Diego Armando Maradona to open their Champions League campaign. The match stayed tight and low-scoring throughout, with neither side creating a wealth of clear chances. Arsenal held on to their single-goal lead to claim three points on the road.
Barcelona crushed Feyenoord 5-1 at the Spotify Camp Nou to open their Champions League campaign. Raphinha scored twice, while Karim Adeyemi, Lamine Yamal and Gabriel Jesus also found the net as Barcelona's attack shared the goals around. Feyenoord managed only a single reply on the night.
Barcelona routed Feyenoord 5-1 in their Champions League opener, with Raphinha scoring twice and new signing Gabriel Jesus netting his first goal for the club. Lamine Yamal also contributed a goal and an assist as Hansi Flick's side dominated throughout.
Aston Villa goalkeeper Zion Suzuki started against Club Brugge in the Champions League's opening round, becoming the first Japanese goalkeeper ever to feature in the competition. Villa won 3-2, and Suzuki made five saves despite conceding twice, earning praise from local media for his distribution.
Manchester City beat FC Porto 2-0 away in their Champions League opener under new head coach Enzo Maresca. Erling Haaland, wasteful before the break, headed in two minutes into the second half and added a late finish in stoppage time to seal the win.
Borussia Dortmund beat Villarreal 3-2 at Signal Iduna Park in a five-goal Champions League opener, going ahead through an own goal before Villarreal equalised, only for Serhou Guirassy to score twice in the closing stages, including a penalty, to seal the win.
Manchester City beat Porto 2-0 away in their Champions League opener, with Erling Haaland scoring twice after missing several first-half chances, sealing the win in stoppage time and handing new head coach Enzo Maresca his first Champions League victory in the dugout.