MILAN - Milan kept their hopes of winning the league title alive with an empathic 4-1 win at Siena.Antonio Cassano made his first start in six months while Kevin Prince Boateng was also a welcomed starter for the trip to Tuscany.It was Cassano who opened the scoring on 27 minutes when goalkeeper Brkic fumbled a low cross from Ibrahimovic and the striker was on hand to finish. The second arrived two minutes later and this time Ibrahimovic received a pass from Cassano and drove a powerful shot into the roof of the net from inside the area.Milan controlled the second half and could have extended their lead on a couple of occasions but were given a late scare when Bogdani slotted home after Abbiati had pushed away a shot.However, substitute Antonio Nocerino produced a stunning finish after running half the length of the pitch before evading two challenges inside the area to fire the ball home for number three.Ibrahimovic grabbed his second and Milan's fourth deep into added time when he was left with time inside the area to hit a low shot.Siena 1 - 4 Milan Cassano 27 (M), Ibrahimovic 29, 93 (M), Bogdani 83 (S), Nocerino 90 (M) Siena: Brkic; Vitiello, Rossettini, Terzi (Contini 36), Del Grosso; Grossi (Bogdani 65), Vergassola, Gazzi, Brienza; Larrondo (Bolzoni 54), Destro Milan: Abbiati; Abate, Bonera, Yepes, Mesbah; Gattuso (Nocerino 73), Van Bommel, Muntari (Aquilani 60); Boateng (El Shaarawy 80); Ibrahimovic, Cassano Ref: Brighi