AC Milan and Juventus beat Lecce 3-0 and Atalanta 2-0 at home respectively on Sunday to stay on the tracks of pacesetters Roma, Inter and Lazio but Cesc Febregas's Como suffered a surprise 2-0 defeat at promoted Frosinone.
Roma and champions Inter top the table with 13 points from five games after drawing 2-2 with each other in the Italian capital on Saturday, with Inter captain Lautaro Martinez's double cancelling out Manu Kone's brace for the hosts.
Third-placed Lazio also have 13 points thanks to a 2-0 win at bottom side Venezia on Saturday.
Cagliari are a surprise fourth with 12 points following a 1-0 win at Udinese.
Milan are fifth with 11 points, while Juve and Como are one point further back along with Frosinone.
Napoli are ninth with seven points after being held 1-1 at Fiorentina on Sunday.
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