Ray Allen scored 20 points and Paul Pierce added 19 as the defending Eastern Conference champion Celtics beat the new-look Miami Heat, 88-80, in the NBA season-opener at Boston’s TD Garden last night. Miami grabbed everyone’s attention in the offseason by acquiring reigning two-time NBA MVP LeBron James and former Toronto All-Star forward Chris Bosh to join forces with Dwyane Wade. The blockbuster moves gave Miami three players with 17 All-Star appearances between them and tons of championship expectations. James led the Heat with 31 points on 10-of-21 shooting, and Wade and Bosh added 13 and eight points, respectively. Allen made five three-pointers, including a key late dagger for the Celtics, who lost in seven games to the Lakers in the NBA Finals last season.