Gonzalo Higuain struck the winner 15 minutes from time as Napoli beat Serie A leaders Fiorentina 2-1 at the San Paolo stadium to clinch their third straight league win.
Lorenzo Insigne put Napoli ahead one minute after the re-start before Nikola Kalinic pulled the Viola level in the 73rd minute.
Napoli hit straight back two minutes later when Higuain stole the ball and played a one-two with Dries Mertens before hitting a left-footed shot past Fiorentina goalkeeper Ciprian Tatarusanu.
The defeat in Naples, only Fiorentina's second of the campaign, ended their five-match winning run in Italy's top flight.
The Viola will fall into second place if Inter Milan beat Juventus later on Sunday.
With the win, Napoli climbed to fourth in the standings - just three points below Sunday's opponents.
The hosts went into the contest after victories over Juventus and AC Milan prior to the international break.
Fiorentina could have taken a 1-0 lead in the 17th minute but Napoli goalkeeper Pepe Reina did well to keep out a bullet strike from Jakub Blaszczykowski.
After a level first half, Napoli went in front when Marek Hamsik set up Insigne in the box and his diagonal strike beat Tatarusanu.
Fiorentina pressed forward and got an equaliser when Josip Ilicic fed Kalinic in the heart of the area and he struck a shot towards the bottom-right corner of the goal.
Higuain had the last say when he coolly struck his sixth league goal of the campaign to earn Napoli three points.
The hosts held on for their fourth win of the campaign.
ends