Napoli didnt get a single cut clean chance
partially because asamoah shut maggio up, our defence kept cavani and pandev in their back pockets
mostly because of the incredible tactical awareness that marchisio displayed, cutting off the passing and movement towards napoli's strikers, while setting up on the other side.
If you look at the game with a tactical point of view, its very easy to see how marchisio dislocated nearly every attempt at building an attack in the middle, on his own.