LeBron James had 31 points and 12 rebounds, Chris Bosh hit a career-best three 3-pointers - the last sparking the run that put it away - and the Heat won their second straight Eastern Conference title.
Rajon Rondo finished with 22 points, 14 assists and 10 rebounds for Boston, which got 19 points from Paul Pierce in what might be the last game of the "Big Four" era for the Celtics.
Catch Game 1 of the finals at 6 p.m. PT Tuesday on ABC7.
The Associated Press contributed to this report.
