Henrikh Mkhitaryan’s double ensured Inter Milan continued their unbeaten start to the season with a 5-1 drubbing against bitter rivals AC Milan.

Inter got off to a perfect start in the Milan derby with two goals from Mkhitaryan and Marcus Thuram, before Rafael Leao gave Milan some hope with a quick finish after the break.

Mkhitaryan earned his brace before Hakan Calhanoglu’s penalty and Davide Frattesi’s goal ensured there was no way back for Milan, who now face Newcastle in the Champions League on Tuesday.

Three points means Inter have now won all four of their games in Serie A this season and remain top of the table by two points.

Mkhitaryan set the tone in the fifth minute with a clean first-time effort from close range, which found the bottom corner and the goal stood despite a VAR check for a foul in the build-up.

The former Manchester United and Arsenal midfielder came close to a second with his header flashing wide of goal and Federico Dimarco then fired a free-kick over the crossbar before Theo Hernandez tried his luck for Milan, but his effort rolled past the post.

Thuram struck to double Inter’s advantage in the 38th minute with a stunning strike across the face of goal and into the top corner.

Milan had a chance after being awarded a free-kick outside the box just before the break, but Olivier Giroud blasted the ball over the bar.

Despite a bright start from Inter in the second half, it was Milan who pulled one back in the 58th minute after a superb through-ball from Giroud found Leao and his deflected shot landed in the net.

Milan goalkeeper Mike Maignan made a good dive to his right to deny Carlos Augusto, who smashed the ball from outside the box, as Inter ramped up the pressure.

Nerazzurri struck again in the 68th minute after a great team move saw Lautaro Martinez lay the ball off to Mkhitaryan before the midfielder found the bottom corner, helped by a deflection, to earn his brace.

Milan’s misery continued when Hernandez conceded a penalty after catching Martinez in the box and Calhanoglu made no mistake from the spot in the 79th minute, blasting the ball low underneath Maignan.

Frattesi capped off a dominant evening for Inter after bursting through the Milan defence to latch onto the end of Mkhitaryan’s well-timed pass and tucked the ball home.