The Derby della Lanterna ended 1-1 after an ill-tempered game that saw Sampdoria go down to 10 men.
Napoli strengthened their grip on second place thanks to a comfortable 2-0 victory over relegation threatened Genoa.
Round-up: A Marco Rigoni stoppage-time header ensured Genoa won an extraordinary game against Lazio 3-2.
Sampdoria defeated local rivals Genoa 3-1 to end a run of seven straight defeats in the 105th Derby della Lanterna.
Round-up: Alexandre Pato missed a first-half penalty as Milan's brief revival ended with a 3-1 home defeat by fourth-placed Fiorentina.
Juventus extended their unbeaten Serie A record to 42 games by scoring three times in the second half in a 3-1 win at Genoa.
Palermo have signed Swiss defender Steve von Bergen from Genoa with goalkeeper Alexandros Tzorvas going the other way as part of the deal.
Juventus maintained their three-point lead at the top of Serie A with a 1-0 win over Cesena while Milan beat Genoa 1-0.
Internazionale held off Genoa at the San Siro to win 5-4 in an encounter that saw two red cards, six yellow cards and incident aplenty.
Roma moved to within four points of the Champions League spots with a nervy 1-0 win over Genoa at the Stadio Olimpico.
Juventus squandered a number of chances as they dropped four points behind AC Milan after a 0-0 draw with Genoa in Serie A.
AC Milan had to overcome tear gas at Genoa's Stadio Luigi Ferraris before downing the 10-man home side 2-0 to go top of Serie A.
All the key facts and stats ahead of Sunday's Serie A matches.
Genoa twice came from a goal down to earn a 2-2 draw at Serie A leaders Juventus in a cracking contest at Juventus Stadium.
French goalkeeper Sebastien Frey has completed his move from Fiorentina to their Serie A rivals Genoa.
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