Leon Powe scored 17 points in the second half, including the go-ahead basket with just over two minutes left, to lead the Boston Celtics to a 90-86 win over the Cleveland Cavaliers in a preseason game Tuesday night. Powe's dunk with 2 minutes, 17 seconds remaining put the Celtics ahead 85-84. Boston trailed 81-74 following an 8-0 Cleveland run early in the fourth quarter.
