Napoli missed a chance to secure Champions League football next season when they shared a goalless draw with Inter Milan in an entertaining encounter on Saturday.
Rafael Benitez's third-placed Napoli have 69 points and extended their lead over Fiorentina, in fourth, to eight points with three games to play.
Benitez's men created plenty of chances but failed to capitalise on their superiority, particularly in the second half.
Jose Callejon was the worst culprit, volleying wide from Dries Mertens's pinpoint through ball in the 13th minute with the goal at his mercy, while Gokhan Inler struck the inside of the post with nine minutes left.
Vincenzo Montella's Fiorentina, who take on Napoli in next Saturday's Italian Cup final, crushed relegation-threatened Bologna 3-0 thanks to a double from Juan Cuadrado and a deflected strike from Josip Ilicic.
Napoli striker Gonzalo Higuain may miss the final after leaving the field on a stretcher four minutes before the end following a thumping challenge from Marco Andreolli on the edge of the box just as the Argentine striker was set to shoot.
Inter, who created chances of their own in a frantic first half, are fifth on 57 points. They are four points behind Fiorentina and six ahead of AC Milan, who lost 2-0 at AS Roma on Friday, and Parma who travel to Cagliari on Sunday.
