By FOX Sports Staff
Napoli capitalised fully on AC Milan's 2-2 draw with Fiorentina earlier in the day by beating Genoa at the Stadio San Paolo.
First half goals from Goran Pandev and Blerim Dzemaili sealed the 2-0 victory which leaves them in a comfortable position to finish second in Serie A.
It also keeps the Scudetto alive but leaders Juventus are nine points clear with only eight games remaining.
"We are not looking at anyone else's position in the table, as we have to focus on ourselves," Mazzarri told Sky Sport Italia.
"We are going through a good period of form and I was happy that we kept a clean sheet. Genoa are a quality side and we did well to dominate them."
"Already we have more points than at this stage last season and are growing constantly, so it is fundamental to achieve Champions League qualification.
"Napoli have returned to being aggressive and determined, but above all sharp physically."
The Neapolitans will now turn their attentions to cutting third-placed AC Milan adrift next weekend.
"From [Monday] we will start thinking about AC Milan. You know that these kind of matches are unique and from a psychological point of view there is no need to talk about specific preparation.
"AC Milan have enjoyed a great revival and we are aware that this is going to be a tough game. We will have to be as brilliant and determined as we are now.
"Let's focus on these last few matches to emphasise our extraordinary season."
Genoa, however, are facing relegation to Serie B after slipping into the bottom three on the back of a fourth defeat in five games.
The Rossoblu are tied on 27 points with Siena and Palermo but have the poorest goal difference of the three.
Head coach Davide Ballardini told La Repubblica: "Have I had a vote of confidence? We've not talked about it.
"We've talked about the future in relaxed terms and about how we'll use the last few games to book our survival.
"Genoa are in good shape. The results have not been good but the overall state of things is fine. I am convinced Genoa have the means to get out of this situation."