Goals in each half from Dusan Basta and Antonio Di Natale kept up Udinese's 100 percent record at home this season with a 2-1 win over Siena, while a late strike from substitute Giuseppe Sculli gave Lazio a 1-0 victory at home to Parma as the two sides reached 21 points from 10 games, a point clear of Milan and two above Juventus.
With forward Antonio Cassano released from hospital earlier in the day after his minor heart operation, Milan won their fifth straight match, crushing Catania 4-0 thanks to goals from Zlatan Ibrahimovic, Robinho and Gianluca Zambrotta and an own goal from Francesco Lodi.
There were wins for Atalanta, Lecce and Chievo Verona but Inter Milan's game at Genoa was also postponed because of floods.
Coach Francesco Guidolin dedicated Udinese's win to the 1,500 fans who had travelled to Madrid to witness Thursday's 4-0 hammering by Atletico.
"We are not as brilliant as we were last year as we've lost players like [Alexis] Sanchez but we are more solid," he told Sky Sports. "We are keeping our form and let's hope it continues for some time to come. We will finish as high as we can."
Lazio, Italy's other side still in the Europa League, looked subdued at the Stadio Olimpico until Miroslav Klose surged into the box to set up Sculli for an 84th-minute winner.
"We don't have many rest days playing the Europa League and you could tell we were tired," Edy Reja, whose in-form Lazio side have now won five of their last six games, told Sky. "But we have a solid group, who know the qualities and defects that we have. Winning this game is a good sign."
