Barcelona made it two wins from two in the Champions League after Ferran Torres netted the winning goal in their 1-0 win over FC Porto at Estádio do Dragão.
Julian Alvarez and Jeremy Doku netted late goals as Manchester City secured a well-deserved 3-1 victory over RB Leipzig in the Champions League.
Newcastle United celebrated the return of Champions League football to St. James' Park by defeating Paris Saint-Germain in front of an electric crowd in Tyneside.
Elye Wahi played a starring role in helping French side Lens come from behind to secure a shock 2-1 victory over Arsenal in the Champions League.
Manchester United's struggles in the Champions League continued after they suffered a 3-2 defeat to Galatasaray at Old Trafford on Tuesday evening.
Jude Bellingham scored an injury-time winner as Real Madrid defeated Champions League debutants Union Berlin 1-0 at the Santiago Bernabeu on Wednesday.
Arsenal marked their return to the Champions League in style following their 4-0 hammering of PSV Eindhoven at the Emirates Stadium on Wednesday evening.
Harry Kane scored from the penalty spot as Bayern Munich commended Manchester United to a 4-3 home win in the Champions League on Wednesday.
Paris Saint-Germain got their Champions League campaign off to a winning start following their 2-0 victory over Borussia Dortmund at the Parc des Princes on Tuesday.
Julian Alvarez played a starring role to help Manchester City come from behind to beat Red Star Belgrade 3-1 as they began their Champions League defence at the Etihad on Tuesday.