Palermo 1-1 Inter MilanInter Milan's hopes of a fifth successive title suffered a setback on Saturday night as Jose Mourinho's side were held 1-1 at Palermo.
Diego Milito fired Inter ahead from the penalty spot after 10 minutes but Edinson Cavani levelled after 24 minutes and neither side could find a winner.
Still, Inter Milan ended the weekend a point clear of AC Milan.
AC Milan 1-1 NapoliAC Milan failed to take advantage as they were held to a 1-1 draw by Napoli at the San Siro.
Hugo Campagnaro put a lively Napoli ahead in the 13th minute, but Filippo Inzaghi equalised 12 minutes later.
AS Roma 4-2 UdineseThird-placed Roma are four points adrift of Inter after Mirko Vucinic netted a hat-trick in a 4-2 win over Udinese.
Luca Toni fired the Giallorossi in front after 14 minutes and Vucinic doubled the lead with his first after 24 minutes.
However, Udinese got back on terms with two goals from Antonio Di Natale, one of which came from the penalty spot.
Vucinic restored the hosts' lead from the spot after 66 minutes and netted his third and Roma's fourth seven minutes from time.
Italian Serie A Top Six Standings
Team Pl W D L Fr Ag Pts Inter Milan 29 17 9 3 54:26 60 AC Milan 29 17 8 4 48:27 59 AS Roma 29 16 8 5 52:34 56 Palermo 29 13 8 8 41:35 47 Sampdoria 29 13 8 8 36:34 47 Juventus 29 13 6 10 45:40 45