AC Milan fall to lowly Sassuolo
''It's a day I will never forget,'' Berardi said. ''I'm happy for the coach as his position was at risk. We played also for him, who took us into Serie A and has a huge heart.''
Milan looked headed for a victory after goals from Robinho and Mario Balotelli inside the first 13 minutes against a Sassuolo side which had lost its past five matches in all competitions without scoring a goal.
However, the 19-year-old Berardi - who is part owned by Juventus - scored his second hat trick of the season before adding a fourth at the start of the second half to take his tally to 11 goals in 14 matches.
New signing Keisuke Honda made his Milan debut and hit the post seven minutes from time before fellow substitute Riccardo Montolivo reduced the deficit in the 86th.
Giampaolo Pazzini almost leveled moments later as his header bounced off the underside of the crossbar but didn't cross the line.