A goal from former AC Milan striker Marco Borriello in the 69th minute earned the Giallorossi AS Roma all three points and took them back into the race for the Serie A title, seven points behind their opponents.
Rossoneri AC Milan had the most of the possession and the better chances, but lacked the cutting edge that had taken them six points clear at the top in recent weeks.
AC Milan started the way they had finished the last two games, which they won by the same 3-0 scoreline, with Robinho coming close to scoring for the third consecutive match in the fifth minute, but he shot wide of the far post after taking advantage of a slip by Philippe Mexes.
The home side dominated the first 10 minutes and created several openings, but never tested Doni in the Roma goal.
Roma's first chance came after half an hour when the lively Jeremy Menez pounced on a loose ball from Ignazio Abate, but shot over from 18 yards.
AC Milan still should have gone ahead in the 35th minute when Zlatan Ibrahimovic beat the offside trap, but he got the ball caught up a bit in his feet and his attempted lob over Doni was instead easy for the Roma goalkeeper to save.
Roma grew in confidence with every passing minute and with every chance Milan wasted.
In the second half, they were more than a match for their hosts and the first big chance came Borriello's way on the hour mark, but he slipped just before shooting and Alessandro Nesta covered and blocked.
The former Milan striker got the decisive goal in the 69th minute, although he knew very little about it.
