Zlatan Ibrahimovic of AC Milan celebrates scoring the fourth goal during the Serie A match between AC Milan v AC Chievo Verona at Stadio Giuseppe Meazza on November 27, 2011 in Milan, Italy.

Zlatan Ibrahimovic scored twice, including his 100th Serie A goal, in AC Milan's embarrassingly one-sided 4-0 win over Chievo on Sunday.

The home team scored all its goals in the first half and then strolled through the second to go level on 24 points with Udinese, one behind leader Juventus.

Nineteen-year-old Luc Castaignos claimed an 89th-minute winner to give lackluster Inter Milan a lucky 1-0 triumph at Siena, his first league goal since his move from Feyenoord in the close season.

Inter's second successive win lifted Claudio Ranieri's injury-hit team to 12th with 14 points from 11 games as it continued its climb up the table following a terrible start to the campaign.

"We are aiming for the scudetto," a confident Ranieri told reporters. "We've given ourselves the target of winning everything, we're going well and we have to carry on."

Adrian Mutu grabbed both goals as lowly Cesena beat Genoa 2-0 to move off the bottom.

The Romanian converted a 70th-minute penalty and scored with a shot on the turn 10 minutes later as Cesena, which has nine points, climbed above Lecce.

Palermo maintained its 100 percent home record with a 2-0 victory over Fiorentina whose coach Delio Rossi had two spells in charge of the Sicilian team last season. Goals by Fabrizio Miccoli and Josip Ilicic gave Palermo its sixth straight home win, taking it to 19 points in fifth place.

Juventus, unbeaten after 11 matches and with a game in hand on its rival, won 1-0 on Saturday at Lazio which is fourth with 22 points.