Mazzarri felt Inter would've beaten Napoli if they had taken some of their many first half chances.
"We weren't attentive enough in the first half on their counter-attacks, which are their greatest strengths, and it's a shame we didn't take any of our chances. If we'd have scored in the first half, when we deserved to, then we could've won," Mazzarri told Sky Sport Italia.
"There have been too many draws, many of them recently at home with throwing points away. It's a shame, as we played well and couldn't finish the games off."