All the Italian teams in European action this week warmed up with wins with Napoli seeing off promoted Brescia despite Mario Balotelli scoring his first goal for the newcomers.
First-half goals from Dries Mertens and Kostas Manolas ensured the hosts took all three points after their midweek loss to Cagliari, to boost their confidence ahead of a Champions League trip to Belgian club Genk.
Carlo Ancelotti's side stay fourth with 12 points from six games, six behind league leaders Inter Milan who beat Sampdoria 3-1 on Saturday, before they play Barcelona in Europe.