The Argentine scored striker two of his team's four goals at the Stadio Olimpico, and Benitez was delighted with the all-round performance of the striker.
"Clearly Higuain is a player who can make the difference for us. I spoke to him before the game, but I spoke to many of the players," he told Sky Sport Italia.
"The most important thing is not just that he scored, but that he put in a good performance, scared defenders and create space for teammates. It was difficult for us to play our style of football on this turf."
Napoli are currently third in the Serie A table.