Inter Milan missed the chance to put pressure on the sides above them in the Serie A table when they were held to a 1-1 draw at Atalanta.
Ricardo Alvarez put Inter in front 16 minutes in, controlling a header down by Rodrigo Palacio and firing low past Andrea Consigli at his near post.
However, Atalanta were defending an unbeaten record at home against Inter dating back to April 2008 and were also looking to make it four straight Serie A wins.
And they were level inside 25 minutes when Maxi Moralez crossed from the right and Argentinian striker German Denis got up above Walter Samuel to head home his fifth goal of the campaign.
Walter Mazzarri's Inter side lost goalkeeper Samir Handanovic to injury at half-time but had chances to win the game in the second half, with Mauro Icardi and Alvarez both coming close.
However, the draw means they have now won just one of their last five games and sit fourth in the table, three points behind Napoli and Juventus and eight adrift of leaders Roma.
On Thursday, Roma will look to extend their record-breaking run of nine consecutive wins at the start of the season when they host bottom club Chievo.
Reigning champions Juventus are at home to Catania on Wednesday, while Rafael Benitez's Napoli go to Fiorentina and struggling Milan face Lazio with coach Massimiliano Allegri under severe pressure.
The Rossoneri lie a lowly tenth in the table and suffered a deeply disappointing 3-2 defeat away to Parma at the weekend.