The Portuguese forward, who returned earlier this month following two months out with an ankle problem, tormented the Marseille defence throughout, netting a clinical double.
"Cristiano Ronaldo was the best player on the pitch," the Marseille-born Zinedine Zidane, now an adviser to Real president Florentino Perez, told reporters.
Ronaldo, sent off for Real at the weekend, put the Spanish side in front after only five minutes, firing a fine 30-metre free kick into Steve Mandanda's top corner.
"We know he is a great player and a great professional," Real coach Manuel Pellegrini told reporters.
"I had already said he would not be affected by his sending off last weekend in La Liga. He has this capacity to spring from everywhere and score."
"I feel better and better and not only because I score goals. I feel better in the game. Everything is fine," said Ronaldo, who is suspended for this weekend's clash with Valencia in La Liga.
"This match will do him good mentally," said Pellegrini. "Too bad he will not be there for the Valence game."
