Juventus 3-0 Frosinone
Ronaldo scored the third goal for Juventus as they extended their lead on top of Serie A table by 14 points after victory over Frosinone, who are second-bottom.
Paulo Dybala scored from Cristiano Ronaldo’s pass to put Juve ahead six minutes.
Leonardo Bonucci, who returned from injury doubled the host lead 17th minute.
Then Cristiano Ronaldo scored his 21st goal of the season in all competitions and his 19th Serie A goal to remain on the top scorers’ chart.
Federico Bernardeschi was denied by Frosinone goalkeeper Marco Sportiello in stoppage time.
Napoli, who are Second-placed will play Torino at home on Sunday.
Juventus will travel to Atletico Madrid on Wednesday in the first leg of their Champions League last-16 tie.