Sulley Muntari set up one and scored the winner for Inter Milan for the second week on the spin with the goal that gave Jose Mourinho's side all three points in the big game against Napoli.
The Ghanaian midfielder scored the second for the defending Serie A Champions on 24 minutes, brilliantly back heeling the ball in with his right from a fine Maicon cross to give Inter a 2-0 advantage.
That goal came after Muntari had set up Colombia defender Ivan Cordoba with a low cross that the center back back volleyed in on 16 minutes.
Argentina international Ezequiel Lavezzi pulled one back for Napoli before the break but Muntari's classy back heel was enough to give Inter all three points.
It was his second goal in as many games after his winner against Juventus in the derby of Italy last week.