Cristiano Ronaldo scored his first Serie A hat-trick to lift Juventus top of Serie A with a 4-0 win over Cagliari on Monday.
Ronaldo scored ahead of Zlatan Ibrahimovic made his debut for AC Milan in a goalless draw against Sampdoria.
Portugal forward Ronaldo struck for the fifth consecutive league game to move the champions back above Inter Milan in their first match since the Italian SuperCup defeat to Lazio in Saudi Arabia last month.
Maurizio Sarri’s side had been pegged back in the first half by the sixth-placed Sardinians.
They pushed for a spot in the Champions League places this season but fell to their third consecutive defeat.
The second-half was all one-way traffic with Cristiano Ronaldo breaking the deadlock just after the interval.
He added a second from the penalty spot on 67 minutes with Argentina’s Gonzalo Higuain coming off the bench to strike a third on 81 minutes.
It happened before Ronaldo completed his hat-trick a minute later.
Juve are three points ahead of Inter in the table with Antonio Conte’s side travelling to Napoli.
Atalanta closed to within a point of fourth-placed Roma, who lost 2-0 to Torino on Sunday.
With a 5-0 rout of Parma, having also beaten AC Milan by the same scoreline before the winter break.
The side from Bergamo were already three goals up before the break thanks to Alejandro Gomez, Remo Freuler and Robin Gosens.
Josip Ilicic added a double in a nine minute second-half spell.
Swedish star Ibrahimovic made his debut for Milan coming off the bench after 55 minutes against Sampdoria.
The 38-year-old came on for Poland striker Krzysztof Piatek to deafening applause from the 58,000 crowd in his first appearance.
He rejoins the club last week.
Earlier, Cristiano Ronaldo named the best player of the year at the 2019 Globe Soccer Awards staged in Dubai.
Ronaldo won the honour for the sixth time.
He scooped Best Men’s Player of the Year at a glitzy ceremony at the Madinat Jumeirah.
England’s Lucy Bronze accompanied Ronaldo winning the inaugural award for best woman.