Orlando and its young stars put up a fight, but the Celtics made the Magic disappear once Paolo Banchero picked up his fifth foul on Tuesday night.
The Celtics, who won the clincher by 31 points, earned some rest by closing out the opening-round series in five games.
The Knicks lost Tuesday’s Game 5 to the Pistons and have to travel back to Detroit for Game 6 on Thursday night. That series is the only Eastern Conference series still going. If the Knicks lose again, Game 7 will be at Madison Square Garden on Saturday.