The Portuguese star was on target for the Serie A champions with two second-half goals, the first a 50th-minute tap-in followed by a low drive 15 minutes later, as Juventus maintained their ideal start to the Serie A season with a fourth win in four games.
The Portuguese star Ronaldo scored 451 goals in 438 games with Real Madrid, including a record 120 in Champions League play.
The 33-year-old then finished off a rapid counter-attack by shooting into the bottom corner after 65 minutes.
The incident occurred in the build up to Sassuolo's injury-time consolation goal in Juventus' 2-1 win, following a collision with Di Francesco.
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Cristiano Ronaldo looked "absolutely desperate" to open his account for Juventus after failing to find the target in his opening three Serie A games, according to head coach Massimiliano Allegri.
The first half ended goalless, but in the second half, Cristiano Ronaldo scored his first goal for Juventus in the 50th minute.
"Sometimes we can't control our anxiety, but I'm happy".
"I really wanted to score these first goals and I'm happy to have found the net".
On Costa's offence, Allegri added: 'These things shouldn't happen. While the opener was arguably his easiest goal, the second goal was the goal to talk about. Of course, noone knows exactly what was said between the two Serie A players that enraged them so much but there is clearly still bad blood between the Sassuolo and Juventus man.