Indiana’s Bennedict Mathurin, right, puts up a shot as Boston’s Jaylen Brown defends during the first half of Wednesday’s game in Indianapolis. Darron Cummings/Associated Press

INDIANAPOLIS — Pascal Siakam scored the last of his 29 points on a 3-pointer with 6.1 seconds left in overtime to give the Indiana Pacers a 135-132 victory over the previously unbeaten Boston Celtics on Wednesday night.

Siakam tied his single-game career high with six 3s and grabbed 11 rebounds. Bennedict Mathurin scored 21 of his 30 points in the second half, and Tyrese Haliburton had 17 points and 12 assists.

The victory ended Indiana’s three-game losing streak and stopped Boston’s season-opening win streak at four.

Boston charged back from a 19-point fourth-quarter deficit to force overtime and led 132-130 after Derrick White’s layup with 39.7 seconds to go. But Indiana scored the final five points to win.

Jayson Tatum led the Celtics with 37 points. Jaylen Brown added 25 points and had a chance to tie the score but his 3 in the waning seconds was off the mark. White finished with 23 points in the first matchup between these teams since Boston swept Indiana in last season’s Eastern Conference finals.

Siakam scored the final five points for Indiana, tying the score on a midrange jumper with 36 seconds left before giving the Pacers the lead for good.

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