Gian Piero Ventura earned his first point as Chievo manager with a 2-2 draw against Bologna but handed in resignation after the match.
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Genoa sacked Davide Ballardini for third despite relatively good start and re-hire Ivan Juric for third time.
Gonzalo Higuain's two first half goals were followed by a Jack Bonaventura effort, as the Rossoneri move up the table.
Chievo have been docked three points and fined €200,000 after being found guilty of incorrect accountancy practices in the relation to transfer.
Chievo goalkeeper Stefano Sorrentino joked that Cristiano Ronaldo found his mark on Sunday, despite not scoring a goal against him.
Cristiano Ronaldo didn't score in his Serie A debut, but his presence alone led to a spectacle of stature previously unseen in Italian football.
Federico Bernardeschi scored in stoppage time to make Cristiano Ronaldo a winner on his Juventus debut as the champions rallied for a 3-2 win.
Cristiano Ronaldo will make his Serie A debut against Chievo alongside Wojciech Szczesny, Giorgio Chiellini, Leonardo Bonucci and Miralem Pjanic.
A team-by-team guide to the new Serie A season as Cristiano Ronaldo makes the move to the Italian top flight.