Little went right in Game 1 for Irving, who struggled with his shot and finished a game-worst minus-19 on the night.
Brown led all Celtics in scoring, but it was his work on the defensive end that stamped Game 1 for Boston.
The Celtics' defensive strategy worked to near perfection in their win over Luka Doncic and the Mavs in Game 1 of the NBA Finals.
The summer action will formally begin soon for a Sixers team with almost nothing set in stone.