Massimiliano Allegri's men are just the sixth side to win their opening eight games of a Serie A season, while it is the first time in club history that they have been victorious in each of their first 10 in all competitions.
Juventus later posted a video on YouTube and Twitter showing Ronaldo training, with the caption: "Juventus go for goal".
Following the report, police have also re-opened an investigation.
Ronaldo, 33, has strenuously denied the accusations and has hired David Chesnoff, known as the lawyer of the stars, to defend him.
Allegri after the game reiterated his statement from Friday that Ronaldo is "serene" on the pitch but otherwise wouldn't otherwise speculate on the state of the star player's mind amid the rape accusation.
U.S. police on Monday re-opened an investigation into accusations by former American model Kathryn Mayorga that the former five-time Ballon d'Or victor raped her in a Las Vegas hotel in June 2009.
He was heavily involved in his side's attacking play, and had headed one chance over the bar before netting Juventus' second goal with a crisp finish into the far corner from Mario Mandzukic's lay off.
Available again for Juventus on Saturday, Ronaldo's mother, Maria Dolores Aveiro, sent her son a message on Instagram: "Good luck son and for your team because together we are stronger".
Speaking to television reporters on the Spanish island of Lanzarote, Mr Costa spoke in defence of Ronaldo, appealing to the presumption of innocence, as well as Ronaldo's successful career.
Ronaldo missed Tuesday's Champions League match against Young Boys because he was suspended for one game after receiving a red card against Valencia.
"And if there's something we have proof of is that he is an extraordinary professional, an extraordinary sportsman, an extraordinary footballer, and someone who has honoured and given prestige to Portugal".
Some Juventus fans at the match also expressed support for Ronaldo.
"Rape is just an excuse. I really don't think it's true". Their share price, however, have fallen in the wake of lawsuit with CNN reporting that it fell " almost 10% on Friday" and CBS Sports reporting a near 20% drop after the the allegations surfaced.
The Portuguese striker "has shown in recent months his great professionalism and dedication, which is appreciated by everyone at Juventus", the club wrote on Twitter Thursday, breaking their silence over the allegations.
Juventus have won all eight of their Serie A matches this season and lead the Italian championship by nine points after Saturday's matches.