LeBron James dribbled out the final 20 seconds while players embraced as the Cavaliers completed a sweep of the Celtics.
James led Cleveland with 27 points. Kyrie Irving had 24 points for the Cavaliers and Iman Shumpert added 15.
Isaiah Thomas and Jared Sullinger had 21 points apiece for Boston.
The Cavaliers led 57-36 at halftime even though James missed eight of 12 shots and Kevin Love missed most of the half.