The 33-year-old then finished off a rapid counter-attack by shooting into the bottom corner after 65 minutes. "I'm happy, I'm working hard and my team-mates are really helping me to adapt to this league".
Ronaldo's first Serie A goal came in fortunate fashion, but lifted a huge burden off the former Real Madrid man's shoulders.
Ronaldo's brace on Sunday saw him reach an impressive 400 club career goals. Certainly there was a bit of pressure in general after my move from Real, there was a lot of expectation.
Juventus get their Champions League campaign underway on Wednesday as they travel to Spain to take on Valencia.
Sassuolo had just pulled a goal back through Khouma Babacar when Costa and Federico Di Francesco squared up.
Ronaldo could have completed a hat-trick late on but missed two easy chances from inside the penalty area.
Vikings-Packers game filled with highs and lows before ending in tie
The good news for the Packers and their fans (like me) is that Aaron Jones is returning from a two-game suspension next week. Williams and Montgomery combined to run 21 times for 90 yards and they should have gotten more carries down the stretch.
United Nations war crimes team documents further Syrian govt. use of banned chlorine
Ankara, which hosts some 3.5 million refugees, has said it could not take any more if an attack on Idlib drove a new surge of people towards its border.
FEMA: Funding transferred to ICE won't harm hurricane response
The agency said it is prepared for Hurricane Florence, which is expected to hit North and SC , and Virginia on Thursday or Friday. FEMA said the biggest danger was the storm surge - a wall of water from the sea which could reach 20ft high.
Although it would appear that Costa could be facing a lengthy ban, few are convinced such an outcome is likely.
I can't confirm that Costa spit into Di Francesco's mouth, but it sure looks like he did.
Juventus, chasing an eighth successive Serie A title, have 12 points, three ahead of Napoli.
Roma appeared to be coasting to a much-needed victory after defeat to AC Milan and a draw with Atalanta. He is up and running and his three-and-a-half game drought (!) is over.
Ronaldo's last act for Real was lifting the Champions League trophy in Kiev after beating Liverpool 3-1 in the final before he dropped the bombshell in a pitch-side interview that he had chose to leave Madrid.