Amid much less fanfare, Argentina forward Gonzalo Higuain, who left Juventus on loan shortly after Ronaldo's arrival, scored his first goal for AC Milan to earn them a 1-1 draw at Cagliari.
It was, however, a spitting offence that saw him deservedly receive his marching orders and he can now expect there to be serious repercussions.
The Portuguese star joined the elite 400-goal list after scoring (Three goals for Sporting Lisbon, 84 goals for Manchester United, 311 goals for Real Madrid, and two goals for Juventus).
It took the former Real Madrid forward almost 320 minutes to score his first league goal for Juventus and he did it with the simplest of tap-ins.
After three games and more than 20 shots on goal, Cristiano has arrived in Italy for Juventus in the most Cristiano Ronaldo way by scoring a brace in their home win against Sassuolo ahead of their Champions League opening match against Valencia away from home. "That's football. What's most important is to win and to do well".
Juventus now turn their attention to the Champions League, which Ronaldo won last season, as they face La Liga outfit in the first game of the group stages.
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Liverpool forward Mohamed Salah won the Golden Boot last season with 32 goals in the league, and scored 44 in all competitions.
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Liverpool earned all three points away to Tottenham on Saturday, and the north Londoners have admitted the win was never in doubt. Firmino was forced off the pitch at Wembley in the second half following a collision with Spurs defender Vertonghen.
However, the real disappointment for Juventus came through Douglas Costa, who was sent off after elbowing and spitting at an opponent.
Juve manager Massimiliano Allegri said after the game that Costa would "rightly" be fined over the incident and would likely face a lengthy suspension. "But he has been working well and I think that tomorrow he will score against Sassuolo".
"I'm very happy, we started well", he told Sky Sport Italia.
Stephan El Shaarawy volleyed Roma in front in the 10th minute and Bryan Cristante doubled his team's advantage with his first goal for the club in the 29th.
The Argentine pounced in the second half, to score his seventh goal in eight games against Cagliari, and 112th in Serie A, coming close to a second from close range.
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.