Cristiano Ronaldo scored twice as champions Juventus pulled level with Inter Milan at the top of Serie A with a 3-1 win over Udinese on Sunday.
Inter were held 1-1 by Fiorentina.
The top two both have 39 points from 16 games.
Rino Gattuso's first game in charge of Napoli after replacing Carlo Ancelotti last week was a 2-1 defeat to Parma.
Napoli are eighth with 21 points.
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