Last season's runners-up AS Roma slumped to their fifth defeat of the Serie A season when they lost 3-1 at new leaders Udinese today.
Italy forward Antonio Di Natale struck twice to ratchet up the pressure on Roma coach Luciano Spalletti, who made his name as boss of the Udine club.
Inter are level with Udinese on 17 points from eight games after drawing 0-0 with 10-man Genoa in another drab home display. Napoli are also on 17 after Sebastiano Siviglia's own goal secured a 1-0 victory at fast-sinking Lazio.
AC Milan are a point behind after Kaka scooped home 10 minutes from time to seal a fortunate 1-0 win at Atalanta, who had troubled a shaky visiting defence.
Atalanta Bergamo 0 AC Milan 1Cagliari 2 Chievo 0
Inter 0 Genoa 0
Lazio 0 Napoli 1
Reggina 2 Lecce 0
Sampdoria 2 Bologna 0
Udinese 3 AS Roma 1
Played on Saturday
Juventus 1 Torino 0
Siena 1 Catania 1