Napoli moved back to within six points of Serie A leaders Juventus on Sunday, as goals from Adam Ounas and Lorenzo Insigne clinched a 2-0 win over Sassuolo.
Fiorentina shrugged off their midweek defeat to Inter Milan and reclaim third place in Serie A with a 2-0 win over Atalanta.
Juventus maintained their perfect record in Serie A as a 2-0 home win against Bologna gave the Turin club their best start to a season in 88 years.
Cristiano Ronaldo bounced back from his red card against Valencia by opening the scoring in Juventus' 2-0 win over Frosinone.
Gonzalo Higuain scored his first Serie A goal for AC Milan but they were held to a 1-1 draw at Cagliari on Sunday.
Serie A club Chievo have been deducted three points and fined €200,000 (£180,000) by the Italian FA (FIGC) for false accounting.
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