Napoli's troubles continued when they squandered a two-goal lead and were held 3-3 at home by Palermo in Serie A while leading pair Juventus and Roma both won to maintain their perfect records after four games.
Arturo Vidal scored twice to give titleholders Juventus a 3-0 win over Cesena as they became the first team to complete their opening four Serie A games without conceding a goal.
A late Miralem Pjanic strike gave Roma a 2-1 win at Parma after Adem Ljajic had put the visitors in front and Paolo De Ceglie had levelled for Parma.
Pablo Daniel Osvaldo scored with a scissors kick to set Inter on the way to a 2-0 win over Atalanta and Fiorentina were held 0-0 at home by Sassuolo.