Udinese moved top in Serie A with a 2-1 win over Chievo on Sunday, while AC Milan earned a controversial 2-2 draw at Bologna.
Antonio Di Natale opened the scoring for hosts Udinese in the 66th minute at the Stadio Fruili.
The veteran striker capitalised on Udinese's considerable pressure to break a long deadlock, heading home Mauricio Isla's cross.
Dusan Basta made it 2-0 with a diving header from a corner on 78 minutes.
Substitute Alberto Paloschi pulled one back for Chievo with seven minutes to go, as he sent a looping shot over Samir Handanovic in the Udinese goal.
But the visitors proved unable to force an equaliser in the time remaining.
Victory sees Udinese move into first place at the expense of Juventus, who can regain the lead if they beat Roma away on Monday.
Reigning champions Milan missed their chance to go top as they were held 2-2 at Bologna.
The home side led from the 11th minute at the Stadio Renato Della'Ara, thanks to Marco Di Vaio's lob over Milan goalkeeper Marco Amelia.
Clarence Seedorf levelled in style for the visitors four minutes later, with a curling strike from just outside the area.
Bologna should have had a penalty in first-half stoppage time, when goal-scorer Seedorf handled the ball inside the area.
While the referee waved away appeals from the home side on that occasion, he would point to the spot in Milan's favour on 70 minutes.
The penalty was awarded against Andrea Raggi for a trip on Zlatan Ibrahimovic.
The Sweden international duly converted from the spot, giving Milan a 2-1 lead with 20 minutes remaining.
As in the first half, the lead did not last long, with Amelia guilty of gifting Bologna an equaliser three minutes later.
The goalkeeper failed to deal with Alessandro Diamanti's routine shot, which squirmed into the net for 2-2.
Both sides had chances to win it late on, while the visitors had a penalty appeal for handball turned down in the final moments.
The draw leaves Milan third, one point behind Juve and two back from Udinese.
Also on Sunday, Atalanta came from behind to draw 1-1 at home to 10-man Catania.
Simone Tiribocchi scored for the hosts with 19 minutes to go.
His goal cancelled out Nicola Legrottaglie's first-half opener for Catania, who had Nicolas Spolli sent off on 42 minutes.
Elsewhere, Cagliari were held 0-0 in their match at home to Parma.