Argentina striker Icardi, who scored a hat-trick in a 7-1 battering of Atalanta in last season's corresponding fixture, was denied an opener by a smart save from Etrit Berisha during a mundane first half at San Siro.

The irrepressible striker  would not be denied shortly after the break as he opened the scoring with a simple header to bring the home fans to their feet.

Inter's captain came up with the goods again on the hour with another header to essentially put the game to bed and take his tally in a prolific season up to 13 league goals, two behind Serie A's leading scorer Ciro Immobile.

The double ensured Inter took full advantage of Juventus's surprise 3-2 defeat to Sampdoria  and Luciano Spalletti's side, unbeaten through 13 matches, is just two points adrift of table-topping Napoli.

Ivan Perisic and Antonio Candreva threatened during a bright start from Inter, but it was the visitor that carved out the first clear sight of goal after 15 minutes.

Hans Hateboer threaded a clever pass into the path of Josip Ilicic and the Slovenian's low drive was repelled by his compatriot Samir Handanovic at the near post.

Inter was seemingly rattled and spent the next 10 minutes trying to regain its footing. When it did settle back into its rhythm it should have taken the lead courtesy of Icardi.

Borja Valero's flick through the middle released the Argentinian, who had brilliantly spun his marker, but his effort was too close to Berisha, who was able to get his leg to the initial shot and then scoop the ball up at the second attempt. 

Five minutes before the interval, Icardi thought he should have had a penalty after being held back in his attempts to reach another dangerous cross, only for his protestations to be waved away by the referee.

Icardi headed straight at Berisha moments after the restart, but he did not have to wait long to get on the scoresheet as he evaded his marker to head home Candreva's free-kick from six yards in the 51st minute. 

The 24 year-old grabbed his second just nine minutes later, steering a superb header into the bottom corner from Danilo D'Ambrosio's right-wing cross. 

Any hopes Atalanta had of finding a way back into the game were all-but extinguished by that goal, and Hateboer had to be on hand to prevent Icardi wrapping up his hat-trick from Perisic's fizzed pass, as Inter comfortably saw out the three points.