Ronaldo opened his goalscoring account for Juventus as the Old Ladies scrambled a 2-1 win against Sassuolo.
The former Madrid star netted his 399th and 400th league goals in club football.
The Portuguese netted his first on 60 minutes from close range after Sassuolo failed to clear a Juventus corner.
Ronaldo got his second when he drove a left-footed strike into the goal from an Emre Can assist.
There was drama in the end with Sassuolo getting a late goal. Douglas Costa was also sent off but Juve managed to see this one through.
Cristiano had gone three games without scoring a goal for the Serie A champions before this one but that Would be behind him now as he looks ahead of the trip to Spain on Wednesday when Juventus play their Valencia.