Napoli took full advantage of Inter Milan's first defeat of the Serie A season to take over at the top.
Torino punished 10-man Lazio as they left the Stadio Olimpico with a rare 3-1 win.
Torino recorded a fourth straight Serie A draw as they were held 1-1 by mid-table rivals Atalanta at Olimpico di Torino on Saturday night.
Juventus returned to winning ways with a comfortable home victory on Sunday while Napoli moved back to the top of Serie A.
Massimiliano Allegri's decision to rest two key players backfired as Juventus lost 3-2 at Sampdoria.
Second-half goals from Gonzalo Higuain and Juan Cuadrado meant Juventus came from behind to inflict a 12th straight Serie A defeat on struggling Benevento.
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