Real Madrid, even without the injured Gareth Bale, made it 10 goals in two Champions League games with an easy 4-0 win over FC Copenhagen at the Bernabeu.
Zlatan Ibrahimovic wasted little time in showing that Paris Saint Germain will be serious contenders in the Champions League this season by having a hand in all three goals as his side raced into a 3-0 lead against Benfica inside the first 30 minutes.
A header from the Swede made the game safe as PSG coasted to a 3-0 win.
In Manchester City's group, CSKA Moscow picked up their first points of the campaign with an unconvincing 3-2 home win over Viktoria Plzen, the Czech side's goalkeeper Matus Kozacik gifting them the winner by letting in a back pass.
Simon Rolfes had given Leverkusen the lead in first-half injury time.
But former Arsenal striker Carlos Vela looked to have earned the Basque side a point with a 51st minute equaliser, bundling the ball home after Bayer keeper Bernd Leno saved his penalty.
However Hegeler, on as a substitute, struck with a curling free-kick for the Germans.