MIAMI — Anfernee Simons scored 18 of his season-high 39 points in the fourth quarter, Jaylen Brown added 27, and the Boston Celtics trailed most of the way before rallying to beat the Miami Heat 119-114 on Thursday night.

Sam Hauser added 17 points for the Celtics, who outscored Miami 36-21 in the fourth quarter and won after facing as much as a 19-point deficit. It was their second-biggest comeback win of the season, after coming from 20 down to beat Indiana on Dec. 22.

Simons had the second highest-scoring game for a reserve this season — Utah’s Brice Sensabaugh had 43 on Wednesday night in a loss to Chicago — and became the fourth Celtics player in the last 50 years to score at least 39 off the bench. The others: Larry Bird, Todd Day and Payton Pritchard.

Norman Powell scored 26 points for Miami, which got 22 points apiece from Bam Adebayo and Tyler Herro. Andrew Wiggins added 16.

Simons had 11 consecutive Boston points in the fourth quarter to chip away at what was left of the Miami edge, and then Hauser got an open 3-pointer with 5:21 left to give the Celtics their first lead since the opening minute of the game.

The lead changed hands twice more before Brown’s 3-pointer with 4:05 remaining put Boston on top for good.

Miami started the game on a 28-9 run, putting the Celtics in a most unusual early position.

That 19-point margin — only about seven minutes into the game — matched the biggest first-quarter deficit the Celtics faced in a 304-game span since trailing Indiana by 20 early in a game on Dec. 21, 2022. Boston also trailed Milwaukee by 19 in the first quarter on April 9, 2024.

The Heat played without starting point guard Davion Mitchell (left shoulder contusion) and sixth man Jaime Jaquez Jr. (left knee soreness).

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Celtics: At Atlanta on Saturday night

Heat: Host Oklahoma City on Saturday night