Napoli are now equal on points with Lazio who rallied past Sassuolo, to stretch their winning streak to four games.
Torino were unable to make most of man advantage and remain 18th after just two wins all season, matching their previous worst run after 18 games.
Inter played with the ferocity coach Antonio Conte had been demanding and Sassuolo barely had a sight of goal apart from a curled effort from Filip Đuričić that hit the outside of the right post.
Serie A: Ageless Ibrahimovic's brace helps AC Milan beat Napoli; Inter Milan come from behind to defeat Torino
Zlatan Ibrahimovic scored twice to raise his total to 10 goals in six games played as Milan won 3-1 at Napoli on Sunday.
Ronaldo is currently isolating at his home in Turin after testing positive for COVID-19 on 13 October while with the Portuguese national team for Nations League matches.
Serie A: Atalanta ease past Cagliari with a 5-2 victory; Inter Milan settle for 1-1 draw against Lazio
Inter Milan dropped their first points of the season as they drew 1-1 against Lazio in Serie A while Atalanta made it three wins out of three with a 5-2 victory over Cagliari.
Serie A: Gaetano Castrovilli's lone goal headlines Fiorentina's win over Torino; Roma held by Hellas Verona
Bosnia forward Edin Dzeko was left on the bench for the side from the capital amid reports he is set for a move to Juventus.
The result left Atalanta level on 71 points with second-place Inter Milan, which visits Roma on Sunday. Italian league leader Juventus has a six-point advantage and hosts fourth-place Lazio on Monday.
Serie A: Gennaro Gattuso's Napoli continue good run after restart with win over Hellas Verona; Parma thump Genoa
Napoli have now moved within three points of fifth-place Roma, which plays Sampdoria on Wednesday.
Serie A: Torino's Nicolas Nkoulou takes a knee after scoring against Parma as Italian league resumes
The first Serie A goal in 103 days was marked by scorer Nicolas Nkoulou taking a knee as the Italian league resumed with tributes for the country's healthcare workers and victims of the coronavirus pandemic.
Serie A: Brescia owner Massimo Cellino asks legal team to deliver dismissal letter to Mario Balotelli, say reports
While neither Brescia nor Balotelli have made any official statements over the striker’s status with the team — and both parties did not respond to requests for comment — the case is likely headed for an arbitration panel and could take weeks to resolve.
Serie A clubs clash with federation amid coronavirus chaos; Inter Milan chief says season runs risk of not finishing
Amid a global health crisis, Italian soccer teams and Serie A's governing body are squabbling with each other about when to play games with Inter Milan chief executive Giuseppe Marotta saying the season even runs the risk of being unable to finish.
Ivan Juric’s side left the Juventus stunned as Fabio Borini struck an equaliser before a late penalty from substitute Giampaolo Pazzini completed the comeback.
Serie A: Lazio squander chance to move into second place in league table after goalless draw against Hellas Verona
The game had been postponed from December when Lazio was busy with the Europa League and the Italian Super Cup.
Lazio were fined 20,000 euros and at least temporarily avoided a stadium closure on Wednesday after their fans targeted Brescia striker Mario Balotelli with racist chants.
Serie A: Lazio beat Brescia in match marred by racist chanting; Andrea Belotti scores brace as Torino shock Roma
Mario Balotelli had scored the opener but was twice the target of racist chanting by Lazio fans
World League Forum institutes anti-racism committee after members express worry over racist incidents during football matches
A number of players have been racially abused by fans in recent months, with Brescia striker Mario Balotelli targeted by Hellas Verona's notoriously far-right sympathising supporters earlier this month
Serie A: Disciplinary commission acknowledges racist abuse aimed at Mario Balotelli, Hellas Verona get one-match partial stadium closure
Serie A's disciplinary commission ordered that a section known as the 'Poltrone Est' in Verona's stadium, which can host around 3,500 spectators in the 30,000-capacity ground, be closed for one match.
Serie A: Hellas Verona ban fan group leader for saying Mario Balotelli not 'completely Italian' after racist chants
Brescia forward Balotelli threatened to leave the pitch on Sunday after being targeted by monkey chants from a section of Verona's supporters during a Serie A game.
Serie A: Brescia striker Mario Balotelli thanks for support after being racially abused by Verona fans, watch video
Mario Balotelli on Sunday thanked his fellow players and supporters for their support after he was racially abused by Hellas Verona fans, the latest in a series of ugly incidents that have blighted the early weeks of the Serie A season