Napoli coach Rafa Benitez was pleased with victory over Sassuolo.
Napoli won 2-0 to keep hold of third place.
"If we see a team playing with this level of intensity despite it being the third game in eight days, then I can only be satisfied," he told Sky Sport Italia.
"Of course we can always improve. Marek Hamsik is sharper now and has more match fitness, so we're starting to see his quality emerge too.
"We improved in defending because Raul Albiol and Federico Fernandez communicated more with the midfielders and wide men to keep the team tight."
