"It was a great performance," Hamsik wrote in his blog. "We wasted many chances, we're aware of that, as making the most of our potential we should've scored many more goals.
"It's a shame I hit the crossbar, but I am happy because the team is in a good period of form. I am also happy with our position in the table, which is an improvement from the start of the season."
Napoli are next in action when they face Swiss outfit Young Boys in the Europa League on Thursday.