Rajon Rondo had 11 points, six rebounds and five assists for the Celtics, winners of seven of their last eight. Kevin Garnett had 10 points, nine rebounds and nine assists, and Kendrick Perkins had 10 points and nine rebounds in his second game back since tearing knee ligaments in last year's NBA finals.
LaMarcus Aldridge had 17 points and 16 rebounds to lead the Trail Blazers, and Andre Miller added 14 points and seven assists. Wesley Matthews had 12 points but shot just 4 of 15 from the field.
The Blazers made only two of their first 12 shots to start the fourth quarter and fell behind 78-63. But Portland hit five shots in a row, with Rudy Fernandez making a 3-pointer to cut the deficit to 82-77 with 48.9 seconds remaining. However, Glen Davis and Garnett each made two free throws to seal it.
The Celtics, playing the first game of a four-game road trip, were downright sloppy at times, tying a season high with 21 turnovers. Portland took 26 more shots than Boston, but made just 36 percent from the field.
Aldridge was playing with a bruised hip sustained Monday against Sacramento. The reigning Western Conference player of the week had just nine points in the 96-81 loss, which snapped the Blazers' five-game winning streak.
Against Boston, the Blazers got a lift from the bench in the first half, getting eight points from Dante Cunningham and six points from Patrick Mills. Pierce, who had 14 in the half, made a 3-pointer to give Boston a 40-33 lead. The Blazers cut the lead to four by halftime.
Boston went up 62-52 after Allen made his third 3-pointer and then scored on a layup.
G Marquis Daniels returned to the Celtics after missing a game with a family issue. C Shaquille O'Neal missed his third game in a row with a sore hip. He said before the game he expects to play Friday against Phoenix. … The Blazers did not attempt a free throw until the final minute of the first half. … Portland F Nicolas Batum left the game with a sore hip in the second quarter and did not return.