Mirko Vucinic added another second half spot-kick late on to seal a traditionally explosive derby which started off surprisingly subdued but burst into life after the break.

Lazio's first league defeat since the opening day meant second-placed AC Milan cut the gap at the top to two points and leapfrogged Inter Milan with a 3-2 win at bottom side Bari.

Champions Inter drew 1-1 at home with Brescia on Saturday.

Juventus and Napoli are just a point behind third-placed Inter after 10 games following home victories over Cesena and Parma.