Giampaolo Pazzini has bagged a hat-trick on his AC Milan debut to earn all three points from their trip to Bologna.
The first goal came from a 16th-minute penalty when Nicolo Cherubin pulled him down inside the area.
Alessandro Diamanti equalised when he himself had been felled inside the area by Antonio Nocerino.
Pazzini doubled his tally when he cleared up after Federico Agliardi had spilled the ball, before wrapping up victory in the 85th minute.