Lautaro Martinez had put Inter in front with a header, but Aleksei Miranchuk got Atalanta back on track for a point.
Spezia earned a relegation six-pointer at the Stadio Vigorito, beating Benevento 3-0 with a Tommaso Pobega volley and M’Bala Nzola’s first ever Serie A goals.
Victor Osimhen’s header on a Hirving Lozano cross proved enough for Napoli, as Bologna woke up too late to get back into the game.
Cagliari ultimately earned a comfortable win over 10-man Sampdoria, with Joao Pedro’s penalty and a Nahitan Nandez counter.
Henrikh Mkhitaryan was the undisputed Man of the Match at Marassi, as his hat-trick gave Roma the 3-1 win away to Genoa.
Cristiano Ronaldo’s early goal seemed to be enough for Juventus, but Lazio are the team who never give in and Felipe Caicedo snatched a last-gasp equaliser.
Milan fought back from 2-0 down to hold Hellas Verona 2-2 in an extraordinary match, as Zlatan Ibrahimovic missed a penalty, hit the woodwork, then scored the stoppage-time equaliser.
Fiorentina had more of the ball and the better chances, but were unable to break down Parma in a goalless draw at the Stadio Tardini.
Neither Andrea Consigli nor Juan Musso were tested as Sassuolo-Udinese ended in a goalless stalemate at the Mapei Stadium.
Torino picked up their first home point of the season, but it was another disappointing performance, with Andrea Belotti and Amer Gojak denied by the woodwork.