Marek Hamsik opened the scoring for Napoli after just four minutes into the match held at the Stadio San Paolo, reports Efe news agency.
Napoli forward Dries Mertens doubled his side's lead after converting a penalty five minutes before the end of the first half.
Kalidou Koulibaly scored the third goal in the 47th minute to secure the home victory for Napoli.
Napoli now lead the Serie A table with 21 points, on goal difference ahead of defending champion Juventus, who will be hosted by Atalanta later on Sunday.
Cagliari are in the 14th spot with six points after suffering their fifth defeat this season.
(This story has not been edited by Social News XYZ staff and is auto-generated from a syndicated feed.)
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Doraiah Chowdary Vundavally is a Software engineer at VTech . He is the news editor of SocialNews.XYZ and Freelance writer-contributes Telugu and English Columns on Films, Politics, and Gossips. He is the primary contributor for South Cinema Section of SocialNews.XYZ. His mission is to help to develop SocialNews.XYZ into a News website that has no bias or judgement towards any.