OKLAHOMA CITY — Jayson Tatum scored 36 points and the Boston Celtics beat the Oklahoma City Thunder 132-123 on Monday night.

Tatum has scored 30-or-more points in his last three games, extending the streak on 11-of-19 shooting against Oklahoma City. Jaylen Brown added 25 points and Grant Williams scored 20.

Tre Mann, set a Thunder franchise rookie scoring record with 35 points on 13-of-21 shooting and 7-of-12 sniping from 3-point range.

Shai Gilgeous-Alexander, back in the Thunder lineup after being held out of Sunday’s loss to Orlando, scored 31 points.

Boston opened the first quarter with a 13-0 run, creating a cushion it held most of the game.

The Celtics, who boasted the NBA’s best defensive rating entering Monday’s contest, struggled early to contain the Mann, who was 8 for 8 from the floor in the second quarter.

Boston held a 65-51 lead entering the break and scored 43 points in the third to remain in control.

The Celtics’ advantage reached 26 points before the Thunder closed within single digits. But Oklahoma City was unable to complete the rally.

The Celtics were unbeaten in their four-game trip, which included wins against Golden State, Sacramento and Denver, as they try to lock down a top-four seed in the postseason.

NOTES: Marcus Smart (illness) and Robert Williams III (right knee) were unavailable. . Aaron Nesmith (right ankle) was available after missing seven games. . Al Hordford returned to Paycom Center for the first time since playing for the Thunder last season. He had seven assists, five rebounds and three points.

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