Napoli's Gonzalo Higuain scored early with an acrobatic volley, his fifth goal in three league games, to set them on the way to a convincing 2-0 win over sluggish AS Roma in Serie A.
Roma's defeat in the big game of the weekend in Italy allowed Juventus to pull three points clear at the top after a 2-0 win at Empoli thanks to an Andrea Pirlo free kick and Alvaro Morata's strike.
The champions, who lost for the first time in the league this season at Genoa in midweek, were made to work hard for their win with both goals coming in the second half.
Napoli, who have picked up speed after a slow start to the campaign, moved up to third place on 18 points from 10 games, four behind the second-placed Romans.
The hosts went ahead in the third minute when Lorenzo Insigne's long-range effort was deflected off a defender and Argentina's Higuain, with his back to play, leapt to hook the ball spectacularly into the net.
The superb strike made Napoli fans quickly forget his missed late penalty in Wednesday's 1-1 draw at Atalanta and calmed the atmosphere inside the San Paolo as the sides met for the first time since a fan was shot before May's Italian Cup final.
Napoli supporter Ciro Esposito died in hospital in June and police were out force to prevent any notable violence.
On the field, Jose Callejon and Marek Hamsik both hit the crossbar and Napoli went close again when Kalidou Koulibaly powered down the right and played in Callejon.
The Spaniard dinked the ball over former Napoli keeper Morgan De Sanctis but his effort was so delicate that Radja Nainggolan had time to clear.
Hero Nainggolan then became the villain when he lost possession in the centre circle and the ball was fed to the left flank where Higuain's incisive cross into the area saw Callejon get there first to finally turn it into the net.
"This was a win for a team who work alongside their fans, this is the key, everyone together and united, in this way we can win lots of games," Napoli boss Rafa Benitez told reporters given his side's inconsistencies this term and fan tensions.
Juve's Pirlo broke the deadlock on the hour at lowly Empoli in trademark style, his free kick drifting over the wall and in, although the keeper could probably have done better.
Carlos Tevez, given a partial rest, came off the bench and almost immediately made an impact as he teed up Morata for the second on 72 minutes. Lorenzo Tonelli fouled Tevez late on to receive his marching orders.
Bottom side Parma host Inter Milan in Saturday's late game with the rest of the fixture programme on Sunday and Monday.