Romelu Lukaku scored twice as Inter Milan held on to top spot in Serie A on Monday with a 3-1 win over Napoli to keep the pressure on Juventus who earlier swept past Cagliari with Cristiano Ronaldo netting his first hat-trick in the Italian top flight.
Antonio Conte's Inter ended their 23-year wait for a league win in Naples to stay in pole position, level on points with Juventus after 18 games, but ahead on goal difference.
Lazio are third, six points adrift but with a game in hand, after stretching their winning run in the league to nine matches on Sunday with a 2-1 victory over Brescia.
Former Manchester United striker Lukaku broke through the Napoli defence on 14 minutes with a powerful solo run to beat goalkeeper Alex Meret.
Meret fumbled another Lukaku strike into the net in the 33rd minute as the Belgian took his tally to 14 league goals this season.
Polish striker Arkadiusz Milik pulled a goal back for eighth-placed Napoli four minutes before the break.
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But Lautaro Martinez added the third after the hour mark, following another mix-up in the Napoli defence, to give Inter their first win at the Stadio San Paolo since October 1997.
In Turin, Ronaldo struck for the fifth consecutive league game as the champions bounced back from their Italian Super Cup defeat to Lazio.
"I'm happy with this first (league) hat-trick. But the important thing is the team, which played very well," said Ronaldo, who brought his league tally to 13 goals in 15 games this season.
Cagliari held off Maurizio Sarri's Juve early on, but the second half was all one-way traffic with 34-year-old Ronaldo breaking the deadlock just after the interval.
The Portuguese striker added a second from the penalty spot on 67 minutes then set up Gonzalo Higuain who came off the bench to strike a third nine minutes from time, before completing his hat-trick a minute later.
- 'Like a God' -
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"I wanted to get on the pitch, score a goal and then celebrate like a God in front of the Curva! But it will happen next time."
"I will try everything possible to get Milan going again. There is a lack of faith here."
- Five-star Atalanta -
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"He immediately gave support, but the team is not yet used to his presence, we could look to him more."