Italian league leaders Juventus piled on the misery for Inter, beating their bitter rivals 3-1 to notch their 11th successive home win of the season in Serie A.
Juventus extended their lead to nine points over Roma, whose match at home to Parma was washed out, to stay on course for a third successive scudetto.
Stephan Lichtsteiner, Giorgio Chiellini and Arturo Vidal put Juventus three goals ahead in less than one hour before Rolando pulled one back for Inter.
Inter have won only one of their last 10 matches and have yet to claim a victory this year.