Lautaro Martinez scored twice as Inter went top of Serie A with a commanding 4-0 win over Cagliari at San Siro.

Martinez, who also had a penalty saved, opened the scoring with a first-half header and Alexis Sanchez doubled the lead shortly after the restart.

Hakan Calhanoglu’s thumping 25-yard strike increased the advantage, before Martinez put the icing on the cake by taking his Serie A tally for the season to 10 with a neat finish.

Simone Inzaghi's side moved a point clear of city rivals Milan at the summit of the table after an eighth win in 10 league meetings with the Rossoblu.

No team have scored more goals from set-pieces than Inter in Serie A this season.

So it was no surprise that the hosts netted another to open the scoring against the side that had conceded the most in the Italian top flight, with Martinez powerfully heading in from Calhanoglu’s corner just before the half-hour mark.

Martinez had a great chance to add a second just before the break after Denzel Dumfries was brought down by Alessio Cragno in the box, but the goalkeeper redeemed himself by guessing correctly to keep out the spot-kick.

Inter doubled their lead within five minutes of the restart as Sanchez neatly guided home Nicolo Barella's cross on the volley.

Calhanoglu got in on the act 66 minutes in as he beat Cragno with a stunning long-range strike.

Martinez was on target again two minutes later; latching onto Barella's lofted through ball before slotting in his sixth league goal against Cagliari in seven appearances.

Sanchez rattled the bar late on as the defending champions made an emphatic statement as they rose to the summit.