(CNN) -- Defending champions Inter Milan moved three points clear at the top in Italy after crushing fifth-placed Genoa 5-0 on Saturday.
Serbian midfielder Dejan Stankovic celebrates his incredible long-range strike for Inter against Genoa.
Jose Mourinho's side warmed up for Tuesday's home Champions League clash with Dynamo Kiev with a resounding victory away to one of Serie A's early-season surprise packages.
Second-placed Sampdoria can catch Inter on 19 points with victory at Lazio on Sunday, but would need to win by nine goals to go top on goal difference.
Inter lost 1-0 to Genoa's city rivals Sampdoria at their shared Stadio Luigi Ferraris three weeks ago, but went ahead this time in the sixth minute through Esteban Cambiasso, whose shot on the turn deflected off Francesco Modesto to beat goalkeeper Marco Amelia.
Cambiasso stole possession in midfield to help Wesley Sneijder set up young striker Mario Balotelli for the second goal in the 31st minute, then Genoa's Omar Milanetto had an effort ruled out for offside five minutes before halftime.
Inter playmaker Dejan Stankovic made it 3-0 with an outrageous volley from halfway deep into stoppage time as he connected with stranded keeper Marco Amelia's clearance.
Veteran midfielder Patrick Vieira, who came on at halftime, added his name to the scoresheet in the 66th minute when he held off Modesto and volleyed past Amelia from 10 yards.
Brazilian right-back Maicon completed the rout with 20 minutes to play as he profited from some comical play by the Genoa defense to calmly slot the ball past Amelia.
Earlier on Saturday, third-placed Juventus lost ground on the leaders after being held 1-1 at home by fourth-placed Fiorentina, extending the Turin giants' winless streak to five games ahead of Wednesday's Champions League match against visiting Israeli side Maccabi Haifa.
Peruvian wing-back Juan Manuel Vargas gave La Viola a fifth-minute lead, firing past Gianluigi Buffon after being set up by Montenegro forward Stevan Jovetic.
Striker Amauri leveled in the 19th minute from close range following good work by Italy international Vincenzo Iaquinta.
Fiorentina striker Alberto Gilardino scored four goals in two games for Italy in World Cup qualifiers last week, but he squandered a chance to win the game with nine minutes to go, leaving both teams on 16 points from eight matches.