AC Milan came from behind to stun Udinese and inflict their first home defeat of the season at the Stadio Friuli with a 2-1 victory.
It looked like Udinese coach Francesco Guidolin was going to celebrate his first ever victory against Milan after Antonio Di Natale gave the home team the lead in the 17th minute.
The Bianconeri continued to dominate the game against an off-colour Milan, but were unable to build on their lead and were punished with two late goals from Maxi Lopez and Stephan El Shaarawy.
The win lifted Milan two points above Juventus at the top of Serie A, but the Turin side have two games in hand, while Udinese are six points off the pace in fourth.
Cagliari broke into the top half thanks to a 2-1 win over Palermo at a deserted Stadio Sant Elia.
Mauricio Pinilla gave the home side the lead in the 56th minute, scoring against his former club, and Daniele Dessena doubled their advantage in the 81st minute.
However, a penalty from Abel Hernandez a minute later gave Palermo hope and the home team had to survive a late onslaught from the Rosaneri before earning the points in front of just a few thousand fans.