Brazilian star Kaka masterminded Boca Juniors' downfall as Italian powerhouse AC Milan beat the South American champions 4-2 to win the Club World Cup on Sunday.

Ballon d'Or winner Kaka scored once and set up two goals for Filippo Inzaghi to ensure the European champions became the first team to win the title of the world's best club four times.

Victory was sweet for the Milanese, who lost in a penalty shootout to Boca at the 2003 Toyota Cup, the Club World Cup's forerunner.

"I am really satisfied," said Kaka. "This was the only trophy I wanted that was missing and I can't put my feelings into words."