Inter Milan's troubles continued when they slumped to a 1-0 defeat at rain-soaked Genoa in Serie A after Luca Antonelli headed in from a corner with seven minutes left.
Third-placed Napoli lost ground on leading pair Juventus and AS Roma with a 2-2 draw on Sunday at Bologna after Rolando Bianchi scored in the last minute for the relegation-threatened hosts.
Alessandri Matri scored twice on his debut for fourth-placed Fiorentina in a 3-0 win at table-propping Catania and a late goal from midfielder Hernanes gave Lazio a 3-2 win at Udinese.
Napoli have 43 points from 20 games, four behind Roma and 12 adrift of Juventus who both won on Saturday.
Fiorentina have 40 while Inter are joint-fifth with Hellas Verona on 32 after only one win in their last eight league games.