Boston lost All-Star point guard Rajon Rondo at the beginning of the week to a torn knee ligament and learned Friday that promising rookie Jared Sullinger is also out for the season following back surgery.

"With the injuries, a number of guys are stepping up and that's what we are going to need," said Pierce, who had 14 points, 11 rebounds and seven assists despite sitting out the fourth quarter.

Garnett finished with 14 points and 10 rebounds, Jeff Green scored 17 and Courtney Lee had 14 points and five assists for the Celtics.

"The production is coming from everybody," said Lee, who inherited Rondo's job at point guard. "Rondo, he's our playmaker. He's racked up a lot of assists with his playmaking ability. And now we just have to move the ball and make sure we are in the right spots to execute the offense."

The Celtics had assists on 30 of their 42 field goals while shooting exactly 50 percent. Jason Terry and Leandro Barbosa scored 12 each for the Celtics, who had six players in double figures.

"We have to be a team by committee," coach Doc Rivers said. "I'm asking guys to play different spots. It does create confusion on the other end."

It helped that the Celtics were facing Orlando, which last won on Jan. 16 and has been dealing with injury problems that rival those of the Celtics. The Magic were without their top two scorers in Arron Afflalo (calf) and Glen Davis (broken left foot), then lost point guard Jameer Nelson to a bruised left forearm.

"It's part of basketball and we'll continue to deal with it," coach Jacque Vaughn said. "It means other guys have to fill in and fill roles and we'll keep at it."

Nelson, who averages 7.4 assists and is third on the team in scoring at 15.3 points per game, did not play in the second half.

"I took an elbow to the forearm, so we'll see how I feel tomorrow," he said.

J.J. Redick had 15 points and five assists and Nikola Vucevic had 14 points and 14 rebounds to lead the Magic, who finished with 95 shots. Only 36 of them went in and hardly any midway through the second half.

"We got some good looks. The ball just didn't go in," Vaughn said.

The depleted Magic still managed to push the Celtics through much of the game, taking advantage of 15 turnovers and some shaky free throw shooting as Boston went 9 for 14 from the foul line.

Orlando had been chipping away at the lead in the third quarter, pulling to 57-54 on E'Twaun Moore's three-point play with 5:04 left in the period. Boston slowly rebuilt the lead with a few short runs, then broke open the game in the fourth when the weary Magic wilted defensively.

"They made shots, went on a little run and we couldn't answer back," Vaughn said.

Pierce scored the last four points of the third quarter, putting the Celtics up 72-59 and starting a 10-0 run for Boston. The Celtics opened the fourth quarter 7 for 9, including a series of dunks by Lee and Green during an 8-2 spurt that extended the lead to 86-63.

Andrew Nicholson had 14 points and 10 rebounds, and Moore also scored 14 for the Magic.

Game notes
Boston has won seven straight regular-season games against the Magic. ... Boston had 30 assists. ... The Magic were 1 for 13 on 3-pointers in the first half. ... Orlando has not won since beating Indiana on Jan. 16.