Napoli mix up the race for the Serie A title then by doing the two Milan sides a favour. Juve aren't completely down and out yet but it's getting increasingly likely that their time at the top is over. That's all for now. Goodbye!
Napoli's victory sees them rise to fourth place in Serie A ahead of Roma and Lazio on goal difference. They're just two points behind Juventus now, who stay five points behind Inter and seven behind league leaders AC Milan. This defeat is a big dent to Juve's hopes of winning 10 league titles in a row.
Napoli beat Juventus in two consecutive league games for the first time since 2011! Insigne's penalty has proved to be enough to down the champions who couldn't break down Napoli's stubborn defence. Napoli's stand-in keeper Meret played his part with a series of great saves.
90' + 6' FULL-TIME: NAPOLI 1-0 JUVENTUS
90' + 6' Meret takes the goal-kick and that's it!
90' + 5' Rrahmani makes a heroic diving header to clear a Juve cross from the left. Juve have everyone forward. Petagna's clearance lands to Chiesa who gets impatient and fires over from range. Napoli are so close to victory!
90' + 4' Chiellini hands Napoli a throw-in near the corner flag as his attempted clearance hits his other leg. Napoli can't make the most of it though and Juve escape. Juve are rapidly running out of time.
90' + 2' The chances keep coming for Juve as McKennie is next to force Meret into action. Meret catches the American's header.
90' + 1' Juve have six additional minutes in which to try and score. Six!
90' Chance for Juve! Ronaldo heads straight at Meret from a cross from the left. The Napoli keeper's earning his keep in the past few minutes.
89' Rabiot heads wide from the corner. Juve keep pushing but it's not working out for them. Kulusevski picks up the ball and floats a deep cross towards the left-hand post. It looks promising for the visitors but bounces just out of play.
86' Meret keeps Napoli's lead intact! Juve are upping the pressure as we enter the final minutes. Morata takes a cross on the turn in the six-yard box and Meret makes a quick save with his legs. Juve will have a corner after Meret receives some treatment.
85' Chiesa comes close for Juve! The midfielder shoots from the edge of the area and the ball flashes just wide of the left-hand post. Meret dives the right way and seems to get a hand to it but Napoli get the goal-kick.
84' Ronaldo floats a ball towards Morata at the far post. Morata fouls his man though and Juve's attack comes to naught.
82' Napoli have offered very little in attack this half but they haven't needed to. Now it's a question of whether Juve can break them down. So far, the answer is no.
80' Juve keep pressing the issue as Ronaldo flicks the ball in the direction of his strike partner Morata. Morata is offside though. Ronaldo sees the offside flag himself shortly after.
79' Napoli aren't totally out of the woods yet as de Ligt's volley from outside the box is blocked. However, the Dutchman's foul on Insigne eases the pressure on Gattuso's team slightly.
78' Juve win a corner down their right which Chiesa will take. Chiesa fires it towards the far post where Chiellini heads it towards goal. It almost falls for Ronaldo but Rrahmani clears. It's another Juve corner. This one's cleared by Lozano.
76' Again Lozano wins the header at the near post to keep Napoli safe but takes a bump to the head in the process. The Mexican's holding a bag of ice to his noggin and looks to be OK.
74' Juve's assault on Napoli's goal is not over yet. Napoli fiddle around on the edge of Juve's box and the visitors spring forward. Ronaldo skids the ball towards goal from the left. Meret saves with his feet to hand Juve the corner.
73' Napoli force a corner down their right but it doesn't lead to anything. The hosts have yet to have a shot this half but have managed to hold their own with Juve's prolonged assault of their goal looking to be over for now.
71' Chiellini climbs over the back of Osimhen and gives Napoli an easy free-kick. Juve are about to make another change. They can't afford to lose this really.
69' Danilo's pass goes astray and Insigne approaches the box from the left. Juve block the cross but Napoli still have the ball. Alex Sandro wins a crucial header at the far post to prevent Lozano from heading in.
67' Juve pepper Napoli's goal a bit more. Alex Sandro flashes a shot just wide of the right-hand post. Ronaldo sticks out a leg but is unable to tap it in!
66' Juve patiently pop the ball around as they head for the penalty area. McKennie flicks a pass in the direction of Morata but it ends in a Napoli throw-in.
62' Danilo hangs the ball up for Morata at the far post but Rrahmani beats the Spaniard to it, giving Juve the corner. From it, Juve have the ball in the net but it's ruled out as Chiellini is offside in the build-up.
60' Bernardeschi's cross from the left is headed away. It's clear that Juve's wingers have swapped sides this half. It's not had that much impact on the game yet though.
58' Osimhen earns Napoli some time to think. The hosts' attack breaks down though and Ronaldo gets clipped by Politano to the left of Napoli's box. Juve's free-kick isn't forthcoming.
57' Chance for Juve! The visitors cut the free-kick back to Chiesa who lets rip from the edge of the box. Meret is only partially sighted but manages to tip it out for a Juve corner. Politano heads the corner at the near post.
55' Bakayoko slides in on Juve's new right-back Danilo and concedes the free-kick. He's committed a few fouls now. He'll surely get a card.
53' Bakayoko is everywhere for Napoli at the moment. The Frenchman gets fouled by Bentancur and soon picks himself up.
51' Ronaldo again takes the free-kick. This one whizzes past the top-left corner. Napoli get the goal-kick.
50' Napoli have barely had a touch of the ball since half-time. Juve are giving them no time and space at all. Ronaldo buys a free-kick in dangerous territory as Bakayoko brings him down.
48' Juve are playing with increased intensity now. Chiesa fires a shot wide to the left then Danilo's shot is blocked by Maksimovic. It's a Juve corner. The ball comes to Ronaldo who hooks towards Meret first-time. Somehow Meret is able to catch it at point-blank range! That was a big chance for Juve.
46' Juve start the half brightly as Morata heads wide from Chiesa's cross from the right. Seconds later, the visitors come again and Ronaldo bobbles a shot just wide of the right-hand post from the edge of the area at the second attempt.
46' Napoli get this second half going. They've not made any changes.
Juventus had 60 per cent possession in the opening 45 minutes and they'll probably have even more of the ball in the second half. Despite Napoli's lead this game still feels finely poised; Napoli have drawn just one of their last 25 Serie A games. Can the champions turn this one-goal deficit around?
Napoli lead at the break thanks to Insigne's penalty after Chiellini's face-shove on Rrahmani. Gattuso's men have played well so far and are regularly threatening Juventus on the counter-attack. Juve don't look that bad but haven't really been able to test Meret yet.
45' + 3' HALF-TIME: NAPOLI 1-0 JUVENTUS
45' + 3' Ronaldo smashes the free-kick into Napoli's wall and the referee calls time on the first half!
45' + 2' Juve have a free-kick in Napoli's half now as Insigne fouls Cuadrado. Ronaldo is of course standing over it.
45' + 1' There'll be two minutes added onto the end of this first half. Insigne hits the ball towards the top left corner and Szczesny leans right to catch it. That wasn't a bad effort by Insigne.
43' Chiesa goes for a different approach, cutting inside from the left to fire towards the top right corner. It ends up bending high and wide.
41' Bernardeschi tries to beat Mario Rui down the right but can't do it without barging over his man. Napoli get the free-kick.
40' Juve get caught on the counter and Zielinski races forward. The Poland midfielder is about to shoot when Chiellini steps in to tidy up.
39' These two teams are slugging it out at the moment which is great to see. Morata bears down on Napoli's goal, venturing inside, but his pocket is picked inside the D.
38' Insigne beats de Ligt to slalom into the box and crashes a shot against Chiellini who makes a fine block.
36' Chiesa begs for a free-kick as he's muscled off the ball by Di Lorenzo but the referee isn't remotely interested. Chiesa comes across to the touchline to complain but it doesn't help him.
34' Napoli go looking for a second goal. Insigne receives a pass from Zielinski and fires high and wide to the right from outside the box.
32' Napoli's goal was the hosts' first shot on target in this match. It's been low on shots on target so far but it's still very watchable.
29' PENALTY FOR NAPOLI! The referee comes across to view the monitor and makes up his mind quickly, pointing to the spot! Chiellini did raise his arm to position himself so it's an understandable decision. Insigne steps up to take the penalty kick...
28' The free-kick comes in and Szczesny is out to claim it. Rrahmani goes down in the box though. It appears he took a push in the face from Chiellini. VAR is taking a look...
26' The offside flag goes up against Ronaldo. Up the other end, Cuadrado brings Lozano's run down the left to a halt. It'll be a Napoli free-kick.
24' Meret dives forward to punch a cross clear and earns a free-kick off Ronaldo in the process. Juve may be controlling the game but Napoli are coping well.
22' Chiesa dashes onto a loose ball in midfield and Di Lorenzo slides in to prevent the Juve winger from bursting away down the left. It's an obvious foul.
20' Ronaldo chests the ball down for Bernardeschi who keeps Juve moving. Juve eventually give the ball away to Lozano and Lozano's ambitious shot from distance clatters against a defender.
19' Bakayoko wins possession and looks forward for Osimhen. Juventus get the throw-in.
17' Napoli win a second successive corner, from the left this time. The hosts take the corner short and Lozano nods wide from a cross towards the far post. The angle was tight for the Mexican.
16' There's quite a pleasant, end-to-end feel to this game so far. Politano drags a shot wide from just outside the box. It takes a deflection on the way and it's a corner for Napoli.
14' Lozano's cross from the left is blocked. Insigne's eyes light up as the ball rolls out to him but the Napoli captain smashes his first-time shot wide of goal.
13' Chiellini does very well to hold off Osimhen and win a tackle, sending Juve on the attack. The ball pops up in the box for Bernardeschi who sends his shot skyward! That's a let-off for Napoli who look vulnerable to Juve's pace.
11' Cuadrado darts onto a direct ball from the back and cuts back in the box for Ronaldo whose shot is blocked. Cuadrado is offside in the build-up anyway.
10' Juve look keen for an early goal. Mario Rui plays it safe by handing the visitors another corner. Napoli clear.
8' The offside flag goes up against Cuadrado who's caught offside from Bentancur's attempted throughball. Juve are dictating most of the play so far.
6' Ronaldo shoots straight at Meret from distance in what is an easy catch for the Napoli goalkeeper. Juve will have to be careful in playing the ball out from the back as Napoli's forward line is pressing quite high.
5' Juve win the first corner of the game down their left as Di Lorenzo knocks the ball out of play. Rabiot connects with the corner but the Juve midfielder's header is way over.
3' As expected it's a quiet start to the game as Napoli and Juve figure each other out. Bakayoko gets clipped by Bentancur in midfield and wins a free-kick.
1' And we're off!
The two sides are out on the pitch in Naples. Ospina has been injured in the warm-up so Meret will be Napoli's goalkeeper in this game.
Napoli and Juventus are the two teams that have faced the lowest shots on target per game on average in Serie A this season so this could be a cagey affair. However, there hasn't been a draw in league meetings between this pair since a 1-1 draw in April 2017. Can Napoli get consecutive wins over Juve for the first time since 2011?
There are four changes to Napoli from that defeat to Genoa last week. Rrahmani, Bakayoko, Insigne and Osimhen come in. Juve also make four changes from their 2-0 win over Roma last time out. Bernadeschi, Bentancur, de Ligt and Cuadrado are the new starters.
SUBS: Gianluca Frabotta, Alex Sandro, Daouda Peeters, Dejan Kulusevski, Weston McKennie, Leonardo Bonucci, Alessandro Di Pardo, Merih Demiral, Nicolo Fagioli, Gianluigi Buffon, Carlo Pinsoglio.
JUVENTUS (4-4-2): Wojciech Szczesny; Juan Cuadrado, Matthijs de Ligt, Giorgio Chiellini (c), Danilo; Federico Bernardeschi, Rodrigo Bentancur, Adrien Rabot, Federico Chiesa; Alvaro Morata, Cristiano Ronaldo.
SUBS: Antonio Cioffi, Nikita Contini, Stanislav Lobotka, Eljif Elmas, Andrea Petagna, Davide Costanzo, Alex Meret, Karim Zedadka, Fabian Ruiz.
NAPOLI (4-2-3-1): David Ospina; Giovanni Di Lorenzo, Amir Rrahmani, Nikola Maksimovic, Mario Rui; Piotr Zielinski, Tiemoue Bakayoko; Matteo Politano, Lorenzo Insigne (c), Hirving Lozano; Victor Osimhen.
Juventus, meanwhile, are in fine form lately. Since losing to Inter a few weeks ago Andrea Pirlo's men haven't conceded a goal in three consecutive league games, their longest run since December 2018. If third-placed Juve can keep this run going, their title rivals had better beware.
After a damaging 2-1 defeat away to Genoa last time out, Napoli's title hopes are hanging by a thread. Gennaro Gattuso's team sit sixth in Serie A at the moment but can rise to fourth with a win here. At the very least a victory would help Napoli in the race for a top-four finish.
Hello! Welcome to our live text commentary of this Serie A match between Napoli and Juventus at Stadio Diego Armando Maradona, Naples.