Zlatan Ibrahimovic snatched a last-gasp equaliser for Serie A leaders AC Milan in an eight-goal thriller against Udinese.
Antonio Di Natale put the visitors in front after 35 minutes only for Alexandre Pato to level in first-half stoppage time. Milan trailed 3-1 with just over 20 minutes remaining after Alexis Sanchez netted and Di Natale grabbed a second for himself.
A 78th minute own goal from Medhi Benatia and another Pato strike right eight minutes from time levelled the scores against, but Milan looked to have thrown away a point when German Denis put Udinese in front again on 89 minutes.
But Ibrahimovic struck in the 93rd minute for a 4-4 draw to ensure Milan at least partially took advantage of closest rivals Lazio losing.
A hat-trick from Edinson Cavani and a string of fine saves from Morgan De Sanctis took Napoli up to second in Serie A with a 3-0 win over Juventus.
Cavani netted twice in the first half and scored his and Napoli's third early in the second half as Walter Mazzarri's side leapt above Lazio and inflicted the second defeat of 2011 on Juve, who were actually unfortunate to lose at the Stadio San Paolo.
Lazio slipped up at home to struggling Lecce with a 2-1 defeat at the Stadio Olimpico.
The team which started the day second from bottom managed to defeat the side second from the top with a display of motivation and determination
An own goal from Nelson Muslera in the 39th minute put the visitors in front against a poor Lazio side.
The hosts improved early in the second half and levelled through Stefano Mauri just two minutes in, but Carlos Grossmuller grabbed a deserved winner for Lecce to give them three crucial points in their battle against relegation.
Inter Milan continued their strong start to the year as Esteban Cambiasso scored twice in the second half to see off Catania 2-1.
The 3-1 home win over high-flying Napoli on Thursday was the perfect way for the defending Serie A champions to begin 2011.
And although Inter fell behind during the second period today when Alejandro Gomez netted for the hosts (71), Cambiasso quickly turned the match around (74, 79).
Inter have plenty of ground to make up on leaders AC Milan, after the difficult final weeks of Rafael Benitez's reign, but at least they are starting in a positive manner under new boss Leonardo.
Fiorentina scored two late goals to stun Brescia at the Artemio Franchi stadium. Trailing 2-1 with four minutes remaining, Mario Santana equalised before second-half substitute Adem Ljajic struck the 3-2 winner.
The victory lifted struggling Fiorentina, who had been just two places above the drop zone, to 12th in the Serie A standings with 23 points. Brescia dropped a spot to second bottom.
Sampdoria came from behind to beat Roma 2-1 in a game with three red cards, one penalty and three goals at the Stadio Luigi Ferraris.
Mirko Vucinic put Roma in front in the 18th minute, but the first red card to Roma goalkeeper Julio Sergio and a consequent penalty allowed Sampdoria to level through Nicola Pozzi in the 58th minute.
Stefano Guberti put the home side in front in the 83rd minute, taking advantage of the second costly error of the game from Juan, before Sampdoria lost both central defenders Stefano Lucchini and Daniele Gastaldello to late dismissals.
They still managed to hold on to relieve the pressure on their coach Domenico Di Carlo with an important home win.
Chievo were unable to find a way past inspired Palermo goalkeeper Salvatore Sirigu as their winless run was extended to six games as the game finished 0-0.
The Flying Donkeys have been on a downward spiral in recent weeks but they turned in a much-improved display today which would have been rewarded with three points had it not been for Sirigu.
The visiting 'keeper denied the home side on several occasions while, at the other end, his Chievo counterpart Stefano Sorrentino was almost as impressive with a number of important stops.
Bologna halted a three-match winless run with a 2-0 victory at rock-bottom Bari.
Albin Ekdal put the visitors in front in the 38th minute before Bologna's top scorer Marco Di Vaio doubled his team's lead with 21 minutes remaining.
The result allows Bologna to climb to 10th in Serie A, six points clear of the drop zone.
Robert Acquafresca hit a first-half brace to help Cagliari leapfrog Parma in the Serie A table with a 2-1 win.
The 23-year-old striker, on loan from Genoa, struck twice in the space of nine minutes to put his side in control, before Sebastian Giovinco gave Parma a chance in the second half.
The home side did their best to get back into it further, but were unable to get the better of Michael Agazzi in the Cagliari goal.
Lowly Cesena extended their unbeaten run to three games as they frustrated Genoa in a goalless draw at Stadio Dino Manuzzi.