The curse of the San Siro continued for AC Milan as they lost 1-0 there for the second time this season as Atalanta followed the example set by Sampdoria on the opening weekend.
Luca Cigarini scored the only goal of the game in the 64th minute as the Bergamo side took all three points at a venue where the home team, be it Milan or Inter, have yet to win in five attempts so far this season.
Milan went close enough on numerous occasions, but lacked a cutting edge as a tactically perfect Atalanta side took the spoils with them on their short trip home. Milan were only inches away from finding the back of the net on at least three occasions, but they drew a blank, and lost the game.
Despite spending almost 90 minutes on the attack and sending ball after ball into the visitors' penalty area, the lack of an extra inch on the foot of Nigel de Jong, Giampaolo Pazzini and others ultimately cost i Rossoneri dearly.
As has been the case for city rivals Inter Milan, there has been no joy on the new artificial pitch inside the San Siro. De Jong went agonisingly close to making contact with Antonio Nocerino's dangerous cross in the 70th minute when no fewer than three Milan players were just an inch or two away from diverting the ball in.
Pazzini similarly only just failed to reach a diagonal ball which would have needed just the slightest of touches to beat Andrea Consigli a few minutes later. By this stage, Milan were chasing a game they had appeared to be in control of.
German Denis had given them the first warning when his deflected shot hit the post in the 21st minute as Atalanta played an astute counter-attacking game. Consigli was tested just twice in the first half, first from Stephan El Shaarawy's shot and then from his own defender. A Massimo Ambrosini effort also tested Consigli's grasp with Pazzini just shy of reaching the rebound.
Atalanta took the lead, somehwat against the run of play, in the 64th minute when Cigarini's low shot from 20 yards found the bottom corner of Christian Abbiati's goal.
After the succession of excruciatingly near misses, Atalanta almost struck a final sucker-punch, but Abbiati was able to tip Maximiliano Moralez's shot over the crossbar in the 88th minute. But despite being granted over six minutes of stoppage time, Milan failed to find an equaliser as the pressure increased on Milan coach Massimiliano Allegri after just three games of the season.