Patrick Helmes scored a hat-trick to help Bayer Leverkusen claim a 4-0 win over Norwegians Rosenborg in Group B. Stefan Reinartz scored the other for the German side, who were missing injured captain Michael Ballack.
Porto made a confident start to its Europa League campaign, downing Rapid Vienna 3-0 with an assured performance. Defender Rolando opened the scoring in the 26th minute when he poked in a loose ball from a corner.
Colombian striker Radamel Falcao tapped in a rebound at the back post in the 66th, and midfielder Ruben Michael fired a curling shot from the edge of the area to seal it for the Portuguese club in the 79th.