Ronaldo scored a stunning free-kick before setting up Mesut Ozil to seal the game.
"It was a fantastic night for us. We played well and we scored two goals. It was a very important win for us. We expected a very hard game but we were better than them. It's always good to win the derby and that's what we have to take away from this," said Ronaldo.
"On the individual level I am very happy with my performance, because I scored a goal and provided an assist. But the most important thing is the team, which played very well."