Napoli edged past struggling Venezia 1-0 on Sunday to move level on points with Serie A leader Atalanta.
Romelu Lukaku wasted a chance to put Napoli ahead in the 37th minute from the penalty spot. His effort was saved by visiting goalkeeper Filip Stankovic.
Giacomo Raspadori scored the only goal after 70 minutes, slotting home a loose ball (79mins) after Venezia failed to clear.
Napoli’s third-straight victory brought them level with Atalanta, who drew with Lazio on Saturday, and have a superior goal difference.
Inter Milan, 3-0 winners at Cagliari on Saturday, are third, one point behind the leading duo but with a game in hand.
Napoli can move into sole possession of the lead next weekend when they face Fiorentina, while Atalanta and Inter face each other in the Italian Supercup in Saudi Arabia.