See The New Champions League Record From Real Madrid
Real Madrid became the first club in Champions League history to win all their group matches on two occasions after 4-0 win over Bulgarian s...

https://nvblogmag.blogspot.com/2014/12/see-new-champions-league-record-from.html
Real Madrid became the first club in Champions League history to win all their group matches on two occasions after 4-0 win over Bulgarian side Ludogorets on Tuesday. Already through to the last 16 as group winners, Real, who are the holders, eased to a 19th straight victory in all competitions, surpassing the record of 18 they jointly held with Barcelona. The 10-time champions previously achieved the feat in the 2011/12 season according to UEFA.