The Detroit Pistons couldn't contain LeBron James again. And this time, they didn't stop his teammates until it was too late. James, showing no regard for a defensive plan Detroit spent three days preparing for him, scored 29 points and Mo Williams added 21 as the Cleveland Cavaliers withstood a stirring comeback for a 94-82 win Tuesday night to open a 2-0 lead over the Pistons in the Eastern Conference playoffs.