The AP reports:

Ray Allen scores 24, Celtics edge Knicks 87-85 in Game 1

Ray Allen hit a go-ahead 3-pointer with 12 seconds left off a pass from Paul Pierce and Anthony misfired on his long try at the other end, giving the Celtics an 87-85 comeback victory over the Knicks in their playoff opener on Sunday night…

Allen led the Celtics with 24 points and Pierce added 18 to go along with solid defense on Anthony. Kevin Garnett had 15 points and 13 rebounds, and clamped down on Amare Stoudemire down the stretch.

Stoudemire had 28 points and 11 rebounds for New York, and Anthony finished with 15…

New York may have lost more than a game. Point guard Chauncey Billups left with 51 seconds remaining, and doctors told him the injury was a strained left knee or thigh muscle…

Boston trailed 51-39 at halftime but rallied to take a 66-64 lead early in the fourth. Stoudemire then scored 12 of the Knicks’ next 18 points to power them to an 82-78 lead with 2:46 remaining.