-LRB- CNN -RRB- -- Italian champions AC Milan climbed to the top of Serie A for the first time this season on Friday with a 2-0 win over 10-man Genoa that was delayed for 10 minutes due to supporters fighting outside the stadium . The game was only 15 minutes old when tear gas started flowing into Genoa 's Stadio Luigi Ferraris as police tried to control clashes between the clubs ' supporters . The mid-table home side held out for almost an hour against a Milan team unbeaten in seven previous games -- six of them victories -- but the match turned when Kakha Kaladze was sent off against his former club . The Georgia international defender was booked for the second time after bringing down Zlatan Ibrahimovic , and the Sweden striker netted the resulting penalty for his eighth goal in 10 league games . `` In the first half we had three chances that we could have scored from and that would have opened up the game , '' Ibrahimovic told reporters . `` We 're playing well , we 've got a lot of confidence , also away from home . We 're getting a lot of possession and scoring goals . Brazil forward Robinho was guilty of a shocking miss but Antonio Nocerino eventually doubled the lead with 10 minutes to play , scoring his fifth goal this season after being set up by fellow midfielder Kevin-Prince Boateng . The victory put Massimiliano Allegri a point above Juventus -- who host second-bottom Cesena on Sunday -- with eight wins and three draws from 13 matches . Third-placed Udinese could join Milan on 27 points with victory away to the Rossoneri 's city rivals Internazionale on Saturday . Meanwhile , Bayer Leverkusen moved up to sixth place in Germany 's Bundesliga with a 2-0 win at home to Hoffenheim on Friday . In-form Swiss striker Eren Derdiyok headed his sixth goal this season in the 10th minute , while Sidney Sam lobbed goalkeeper Tom Starke with 11 minutes to play to keep Leverkusen unbeaten in five matches in all competitions -- and 10th-placed Hoffenheim winless in as many matches . Leverkusen now trail Borussia Dortmund and Monchengladbach by four points ahead of the league leaders ' clash on Saturday . If that match ends in a draw , third-placed Bayern Munich can return to the top with a draw or better at home to Werder Bremen .