Two-goal scorer Florian Wirtz had not played in the Champions League before
Florian Wirtz scored twice on his Champions League debut as Bayer Leverkusen cruised to victory at Feyenoord.
The German champions took a fifth-minute lead when Wirtz placed the ball into bottom corner from 20 yards.
Xabi Alonso's marauding wing-backs combined for the second goal as Jeremie Frimpong's cross reached Alex Grimaldo to score.
Former Celtic player Frimpong then picked out 21-year-old Germany international Wirtz, who volleyed in his second of the game.
And Leverkusen had the game won before half-time when Edmond Tapsoba's header was knocked into his own net by home goalkeeper Timon Wellenreuther.
It was a clinical performance from the Bundesliga side, who had fewer shots than Feyenoord.
This was the Dutch side's first defeat since Dane Brian Priske replaced Liverpool-bound Arne Slot as manager in the summer.
Watch highlights of every Champions League game from 22:00 on Wednesday on BBC iPlayer and the BBC Sport website and app.
There will also be a Champions League Match of the Day on BBC One on Wednesday, from 22:40 to 00:00.
