Kevin Garnett and Ray Allen made their Boston debuts, and holdover Paul Pierce scored 22 points to lead the Celtics to a 101-61 victory over the New York Knicks on Wednesday night. Brought in to revive the sagging Celtics after their second consecutive playoff absence, Garnett had 13 points and eight rebounds, and Allen scored 14 points before sitting out the fourth quarter. The New Big Three had seven points apiece in the first quarter as Boston opened a double-digit lead.