Cristiano Ronaldo struck twice on his first competitive start of the season as Real started their quest for a third successive European crown.
Ronaldo has been banned from domestic football since August for pushing a referee and only needed 12 minutes to get back amongst the goals in the competition where he is the all-time top scorer.
Harry Kane struck twice as Tottenham Hotspur made a flying start with a 3-1 win over Borussia Dortmund in Group H opener at Wembley.
