( CNN ) -- Inter Milan 's title defense got back on track with a crushing 4-0 win over city rivals AC Milan , after three first-half strikes capitalized on the sending off of Rossoneri skipper Gennaro Gattuso on Saturday night at the San Siro . New boys Samuel Eto ' o ( left ) and Wesley Sneijder celebrate Inter 's impressive victory over Milan . Thiago Motta put Jose Mourinho 's men in the lead , scoring his first goal for the club after thirty minutes with a left-foot strike , after being played in by fellow new recruit Samuel Eto ' o . The Cameroon striker was involved again for the second when he was fouled when through on goal by an injury-hampered Gattuso to win a penalty for his side , before Diego Milito slotted home from the spot on 36 minutes . Worse followed for Gattuso when the midfielder received a red card for a tough tackle on Inter debutante Wesley Sneijder , before Brazil full back Maicon took advantage of his opponent 's reduced numbers by shooting home form the edge of the area seconds before half time . Further humiliation came in the second half for the nominal home side when Serbian Dejan Stankovic crashed home a 30-yard drive to leave Marco Storari to pick the ball form his net for the fourth time that evening with 23 minutes of the game left . It was a miserable first derby for AC Milan coach Leonardo , who is in the process of rebuilding his side after the departure of former world footballer of the year Kaka to Spanish giants Real Madrid . Where the Rossoneri have lost talent to Spain , Inter have gained ; with former Iberian charges Sneijder and Eto ' o contributing well to their side 's win . Holland midfielder Sneijder tested goalkeeper Storari after only six minutes to signal his team 's intent while Eto ' o had a key role in the following two goals . Eto ' o also had a goal disallowed as he headed into the net from an offside position to cap a telling performance that was in stark contrast to that of Holland international Klass-Jan Huntelaar who made an inauspicious debut for Milan after leaving Real Madrid . Sully Muntari came on as a second-half substitute , seemingly confirming Mourinho 's belief that the player had reduced energy levels as a result of fasting for Ramadan . Elsewhere in Serie A , Bari drew 0-0 with Bologna despite substitute Ferdinando Sforzini being sent off for the home side as the game drew to a close . In a game of few chances Daniele De Vezze went closest to opening the scoring for the hosts .
Inter thrash rivals AC Milan 4 - 0 in derby after Gennaro Gattuso is sent off . Goals from Torres , Rossi , Maicon and Stankovic ensure humiliating defeat . Cameroon striker Samuel Eto ' o has been disallowed to cap good form . Elsewhere , Bari draw 0 - 0 with Juventus despite finishing with ten men .