Freshly back from quarantine, AC Milan's evergreen Zlatan Ibrahimovic has sealed their 2-1 defeat of Inter Milan in the city derby to push the Rossoneri to the top of the Italian Serie A.
The 39-year-old, who ended a coronavirus lockdown on October 9, slammed home his first on 13 minutes, pouncing after Samir Handanovic had parried a penalty the Swede took after he had been floored by Aleksandar Kolarov.
Then a low cross from Rafael Leao found the veteran three minutes later and though Inter pulled one back on 29 minutes, as Romelu Lukaku turned in Ivan Perisic's feed, Milan held on.
Milan coach Stefano Pioli said that Ibrahimovic was tired towards the end of the game and asked to be substituted.
"I did not listen to him, and I made him angry, which normally happens when I replace him," Pioli said.
"He is a champion in everything and his help to the team with his character is crucial."
The Rossoneri, now on a maximum 12 points and boasting a 9-1 goal difference, moved past Atalanta, who crashed 4-1 at Napoli in the weekend opener and stayed on nine points.
"I did not expect such a win because I know what kind of squad Atalanta are," Napoli boss Gennaro Gattuso said.
"We prepared well. We put a great mentality and determination on the pitch."
Napoli are third, one point behind Atalanta, and have appealed against the one-point deduction and default defeat they were handed this week for failing to show up for a fixture against Juventus a fortnight ago over coronavirus concerns.
In Genoa, Sampdoria were 3-0 winners over Lazio, who struggled with Golden Boot winner Ciro Immobile suspended.
Promoted Crotone missed out on the chance of a famous first win of the campaign, drawing 1-1 at home to 10-man Juventus, who were missing the quarantined Cristiano Ronaldo.
The Calabrians went ahead from the penalty spot through Simeon Tochukwu Nwankwo after 12 minutes, but Juve equalised through Alvaro Morata nine minutes later.
The dismissal of the champions' Federico Chiesa on 60 minutes gave Crotone hope of a famous victory, but the scores remained locked.