Juventus cemented their position at the top of the Serie A table as first-half goals from Mirko Vucinic and Alessandro Matri sealed a comfortable 2-0 win over Fiorentina.
Juve knew that failure to condemn Fiorentina to a third straight away defeat would leave the door open for Napoli to close a three-point gap against Lazio.
Boss Antonio Conte had played down talk of a fierce rivalry between Turin and Florence and there was precious little evidence of competition on the pitch as Mirko Vucinic was left unchallenged to slam home the opener.
Matri lost his boot when swinging at Arturo Vidal's canny pass but his socked foot guaranteed Juve all three points before what turned out to be an insipid second half.
Napoli lost valuable ground on Juventus but it could have been worse as Hugo Campagnaro salvaged a late 1-1 draw at Lazio.
Walter Mazzarri's men needed to win in Rome to stay in touch with Juve, who had opened a six-point gap with their victory over Fiorentina.
But Napoli looked like being sucked towards third-placed Lazio when Sergio Floccari opened the scoring early on.
The game grew more and more frantic as time ticked away, with Campagnaro emerging as a key figure all over the pitch, and the Napoli defender would have the final say with an audacious finish three minutes from time.
Information from the Press Association was used in this report