Napoli is unable to break the deadlock in the first half due to the strong defense of Cagliari. Quite a few attempts was made by Napoli but it was all in vain. The second half should be an opportunity for Napoli to win the match in order for them to secure an additional three points. Cagliari wouldn't accept defeat easily, therefore, Napoli need to look for a way to break through their defense.
Indeed, Cagliari didn't accept defeat easily. Napoli only managed to score through Zambo in the 90+5 minute. They were lucky to earn the three points. Even if they only scored one goal, they still earned the three points. That's what mattered, because they're in the title race. Furthermore, their opponents are tough and can give other big teams problems. That's why the three points earned here are so valuable.