BOSTON — Three quarters was plenty of time for Isaiah Thomas to extend his streak of scoring at least 20 points.

Thomas made it 30 games in a row with 21 points, then got to watch the entire fourth quarter from the bench as the Boston Celtics routed the Orlando Magic 128-98 on Friday night.

“All we really care about is the win, but it was great to get our first blowout of the year and be able to rest in the fourth quarter,” Thomas said. “The whole team played a great game tonight.”

Rookie Jaylen Brown added a career-high 20 points, Jae Crowder scored 19 and Kelly Olynyk made all seven shots he attempted, finishing with 16 points.

It was the most points the Celtics have scored this season, five better than Boston’s total in a 127-123 overtime loss to Portland on Jan. 21. The Celtics’ previous high score in regulation came in a 128-122 loss to the defending champion Cleveland Cavaliers on Nov. 3.

The Celtics closed the first quarter on a 15-0 run and continued pulling away from there to their widest margin this season.

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“I thought our shooting and the way we shared the ball were really good,” Coach Brad Stevens said. “The shooting will come and go, but hopefully we can keep sharing the ball like that. That was good.”

The Celtics outscored Orlando 36-17 in the third quarter and finished the game with 39 assists, 11 coming from Marcus Smart and eight from Thomas. Boston also dominated inside, outscoring Orlando 54-34 in the paint and outrebounded the Magic 47-37.

“It’s good to get one of those wins,” Thomas said. “We haven’t had one this season, so it was good for our confidence. We played the right way tonight and we took care of business.”

Nikola Vucevic and Damjan Rudez finished with 14 points apiece to lead the Magic, who trailed by as much as 40 and lost their third straight and fell to 3-11 in January.

“I think we’re frustrated,” Coach Frank Vogel said. “I think we’re undermanned and we have guys trying to perform roles outside their realm. It doesn’t look pretty right now.”

It certainly didn’t Friday night. Boston topped 100 points before the end of the third quarter and got a bonus at the end when Terry Rozier went to the line with the clock reset to 1 second after a video review. Rozier made both foul shots and the Celtics led 104-65 entering the fourth quarter.

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Boston held a 68-48 halftime lead after shooting 61 percent (28 of 46) in the first half. The Celtics outrebounded the Magic 25-16 in the first two quarters and outscored Orlando 38-28 in the paint.

The second half was much like the first.

Elfrid Payton converted a three-point play for the Magic that cut the margin to 79-59 with 7:07 left in the third. Thomas answered with a 20-foot jumper that got the Celtics going on a 22-5 run. Thomas added a 3-pointer and set up Jonas Jerebko for a layup, followed by another miss by the Magic and fast break the other way for a layup by Smart.

Crowder hit a 3-pointer to make it 93-62, then stole the ball from Bismack Biyombo and Thomas converted the turnover into another 3-pointer.