Insigne with an early effort after wriggling free with great feet on the left but Buffon makes the stop.
The ball sits up nicely for Evra on the volley inside the penalty box but he fails to catch it properly and it is well over.
Big blow for Juventus, Bonucci forced off with injury as Rugani, a Napoli target last summer, comes in for his seventh appearance of the season.
Morata off for Juve, Zaza takes his place.
Dybala so close to the opener! Pogba with immense control and he cuts back for the Argentine on the edge of the box, but he blazes over the top with his first chance of the game.
Replays of Morata upon his substitution seem to indicate that he has dislocated his thumb.
Insigne off for Napoli, Mertens on for the final 15 minutes.
Hamsik with a strike in anger in the final 10 minutes, always fizzing off target.
A good break for Juventus with Pogba shrugging off the tackles of four players but he should perhaps have passed. Elects to go alone and Reina saves.
Marchisio booked for Juventus, while Dybala makes way for Alex Sandro.
GOAL! Juventus 1-0 Napoli. Zazza 88'
Gabbiadini on to try and rescue things for the Partenopei. Three minutes added.
Gabbiadini instantly involved but on his weaker right foot, he drags his shot wide. That should be game, set and match for the champions.
FT: Juventus 1-0 Napoli
The champions are back on top!