Palermo could only move to within three points of Roma as they were held to a 0-0 draw at Reggina.
The Rosanero could have cut the gap on Luciano Spalletti's second-placed side to one point, but were unable to break the resistance of the relegation strugglers.
In Saturday's other game in the Italian top flight, bottom club Ascoli remain in single figures after losing 3-1 at home to Atalanta.
Ascoli looked like taking a point when Michele Paolucci (73) replied to Riccardo Zampagna's opener for Atalanta.
However, Pereira Adriano (84) and Cristiano Doni (86, pictured) wrapped up a late victory that ensured Atalanta move into fourth place.