AC Milan are just a point behind Napoli. Lazio and Atalanta are 5 points behind. I would say these four teams have equal chances to win the title. The most important thing to win the title is to perform consistently well. After the World Cup, the team that is able to consistently perform well will win the title. Lazio and Atalanta's performance is good enough. Also the defense of Lazio team is very strong. So I think these two teams have enough chances to win the title.
I have recently paid attention to Lazio, because they have very good dynamics and good defense. Dynamics is a very important thing, if you know how to keep it, then the team can be a leader at a distance. By the way, Napoli is ahead of Milan by 3 points, and Lazio by 5, and Milan are also going very well, I confess I thought that they would not be able to be in the title race this season. Spalletti was able to make everyone talk about Napoli and this is a good result, it will be an important moment when Napoli play in the Champions League playoffs, as far as the team can keep the results in Serie A.