Udinese saw their five-match Serie A winning run end with a hard-fought 1-1 draw at Chievo.
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Napoli took full advantage of Inter Milan's first defeat of the Serie A season to take over at the top.
Inter Milan lost their first Serie A game of the season as Udinese walked away with a 3-1 win at San Siro.
Udinese sacked coach Luigi Delneri on Tuesday and immediately replaced him with Massimo Oddo.
Sami Khedira scored a hat trick as 10-man Juventus recovered to beat Udinese 6-2 at the Dacia Arena.
Udinese ended Sampdoria's unbeaten Serie A start with a 4-0 victory at Friuli, where Blucerchiati midfielder Edgar Barreto was sent off.
Nikola Kalinic was denied a hat trick on review as AC Milan beat Udinese 2-1 to bounce back from last weekend's 4-1 mauling by Lazio.
Udinese owner Giampaolo Pozzo says he is a big fan of VAR -- because it is preventing Juventus from receiving refereeing favours.
Watford have signed goalkeeper Orestis Karnezis on a season-long loan from Udinese and are also set to add defender Molla Wague.
Harry Redknapp has revealed that Emmanuel Agyemang-Badu promised him he'd sign for Birmingham City before opting to join Bursaspor.
Ghana midfielder Emmanuel Agyemang-Badu is eyeing a new challenge after completing his season-long loan switch to Bursaspor from Udinese.
Udinese midfielder Emmanuel Agyemang-Badu has told KweséESPN he wants to leave the Italian club in the current transfer window.