Juventus won the Coppa Italia for the fourth year running with a crushing 4-0 victory over Milan who suffered a second-half meltdown in the final on Wednesday.

Central defender Medhi Benatia struck twice for Juventus and Douglas Costa was also on target on an unhappy evening for Milan goalkeeper Gianluigi Donnarumma who was at fault for the second and third goals.

An own goal by substitute Nikola Kalinic completed a calamitous defensive display by Milan which was likely to have left coach Gennaro Gattuso seething.

Juventus are almost certain to add this year's Serie A title to their trophy cabinet and complete a fourth successive double.

The Turin side are six points clear of Napoli with two games to play and their goal difference is better by 16.

After an even first half with few clear chances, the game changed completely in the second half and was effectively settled in a 10-minute spell.

Donnarumma got down low to his right to make a superb save from Paulo Dybala's rasping drive but that was as good as it got for the 19-year-old.

From the resulting corner, Benatia got away from his marker and stooped to head Juve in front after 56 minutes.

Five minutes later, Donnarumma allowed a low shot from Costa to slip through his hands and into the net and the hapless goalkeeper then failed to hold a header, allowing Benatia to snap up the rebound.

Milan, who like Juventus had not conceded a goal on the way to the final, brought on striker Kalinic but the Croat scored at the wrong end, heading in a corner at the near post under no real pressure in the 76th minute.