The Brazilian made his Major League Soccer season debut Sunday night as Orlando thrashed defending champions Portland Timbers at the Citrus Bowl in Florida.
The ex-AC Milan and Real Madrid midfielder delivered a cross for Seb Hines to head home to put the hosts in front after 13 minutes.
Shortly after the half-hour mark, the 33-year-old exchanged passes with Brek Shea, who fired an unstoppable shot to double the advantage.
And Kaka put the game out of Portland's reach early in the second half with a goal of his own:
A Kevin Molino spot-kick made it 4-0 before Jack McInerney scored a consolation goal in the 89th minute.