Udinese returned to third in the Serie A table following a 4-2 triumph over Parma on Monday night.
Udinese clinched their first away victory of the Serie A campaign with a 1-0 win at Lazio.
Napoli slumped to their second straight Serie A loss as Udinese snatched three points at the Stadio Friuli.
Juventus joined Roma at the top of Serie A with two wins out of two this season after beating Udinese 2-0 on Saturday.
AC Milan beat Lazio 3-1 in Filippo Inzaghi's first Serie A game in charge, while Inter Milan's Nemanja Vidic saw red.
Antonio Di Natale struck twice as Udinese won 2-0 at home to promoted Empoli in Serie A.
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