Napoli maintained their unbeaten start to the Serie A season and returned to the top of the table by coming from behind to beat Genoa.
Dries Mertens scored twice and took his tally to nine for the season after ex-QPR midfielder Adel Taarabt’s opener.
Ervin Zukanovic then scored an own goal to increase Napoli’s lead before Armando Izzo pulled one back.
Paulo Dybala and Gonzalo Higuain scored as champions Juventus, who are three points off top, beat SPAL 4-1.
Federico Bernardeschi gave Juventus the lead in Turin on 14 minutes, and Paulo Dybala doubled their advantage before Alberto Paloschi pulled one back for SPAL.
The hosts put the result beyond doubt in the second half as Gonzalo Higuain and Juan Cuadrado made it 4-1 in five second-half minutes to keep Juventus third.
Elsewhere, Lazio beat Bologna 2-1, while former Liverpool midfielder Suso and ex-Blackburn striker Nikola Kalinic both scored as AC Milan defeated Chievo Verona 4-1.
Some Serie A matches were overshadowed by increasing tensions, days after Lazio fans mocked-up anti-semitic photos.