Napoli ensured Juventus’ miserable start to the Serie A season continued as they held on for a 2-1 victory at San Paolo Stadium.
Max Allegri’s men, who now have just five points from six matches, could find themselves 13 adrift of Inter Milan should the current leaders beat Fiorentina on Sunday night.
Napoli deserved their victory, with goals from Lorenzo Insigne and Gonzalo Higuain securing the points against the team that have won the league title in each of the last four seasons.
Insigne played a neat one-two with Higuain and stroked the ball past goalkeeper Gianluigi Buffon and into the bottom corner to open the scoring, before he hobbled out of the action.
Buffon got a strong arm on Higuain’s low shot but could not keep it out as Napoli extended their lead, and although Mario Lemina squeezed home his first goal for the Bianconeri to offer hope, Juventus rarely threatened an equaliser.
Earlier on Saturday, Roma returned to winning ways with a 5-1 home thrashing of Carpi.
Kostas Manolas tucked away the opening goal from Lucas Digne’s clever assist and the Giallorossi were soon two goals to the good thanks to Miralem Pjanic, whose free-kick whipped past an immobile Zeljko Brkic and into the bottom corner.
Gervinho grabbed his first league goal since November by tapping in Zeljko Brkic’s clumsy attempt to gather Maicon’s low cross before former Roma forward Marco Borriello pulled a goal back with a superb diving header.
On-loan Chelsea winger Mohamed Salah rolled in the loose ball after Francesco Totti’s shot was saved in the 51st minute to make it 4-1 and a fifth Roma goal arrived when Digne connected with Maicon’s cross at the far post.
Carpi’s Ryder Matos saw a penalty saved by Morgan De Sanctis.