Miami Heat forward Jimmy Butler (22) drives to the basket...

Miami Heat forward Jimmy Butler (22) drives to the basket against Boston Celtics guard Malcolm Brogdon (13) in the first half of Game 1 of the NBA basketball Eastern Conference finals playoff series in Boston, Wednesday, May 17, 2023. Credit: AP/Charles Krupa

BOSTON — The Miami Heat were in need of a calming presence following a sluggish start to their latest conference finals showdown with the Boston Celtics.

Jimmy Butler provided that and a lot more.

Butler scored 35 points, including 20 after halftime, and the Heat rallied in the second half to beat the Celtics 123-116 in Game 1 of the Eastern Conference finals on Wednesday night.

He said his teammates have given him confidence.

"I’m playing at an incredible level because they are allowing me to do so," Butler said. “They are not putting a limit on my game. They are trusting me with the ball, on the defensive end. I think that’s what any basketball player wants.”

Miami trailed by nine at the half before turning it around with a franchise playoff-record 46 points in the third and outscoring Boston 66-50 over the final two quarters. It was Butler's fifth game with 30 or more points this postseason and he added seven assists, six steals and five rebounds.

“One of the premier two-way basketball players of this association. ... That’s what we needed.” Heat coach Erik Spoelstra said. “Down the stretch Jimmy was able to do everything we needed – as a scorer and as a facilitator.”

Boston Celtics forward Jayson Tatum (0) reacts after his slam...

Boston Celtics forward Jayson Tatum (0) reacts after his slam dunk in the first half of game 1 of the NBA basketball Eastern Conference finals playoff series against the Miami Heat in Boston, Wednesday, May 17, 2023. Credit: AP/Charles Krupa

Bam Adebayo added 20 points and eight rebounds. Kyle Lowry, Caleb Martin, Gabe Vincent and Max Strus all added 15 points apiece. The Heat went 16 of 31 from the 3-point line.

The No. 8-seeded Heat have opened all three playoff series with road victories. Game 2 is Friday in Boston.

Jayson Tatum led the Celtics with 30 points, but didn't take a shot in the fourth quarter. Jaylen Brown finished with 22 points and nine rebounds. Malcolm Brogdon added 19 points.

Boston is just 4-4 at home during this postseason.

Boston Celtics forward Jayson Tatum (0) is walks to tip...

Boston Celtics forward Jayson Tatum (0) is walks to tip off before game 1 of the NBA basketball Eastern Conference finals playoff series against the Miami Heat in Boston, Wednesday, May 17, 2023. Credit: AP/Charles Krupa

“I don’t know why,” Tatum said of their home struggles. “You’ve still got to play the game, you’ve got to make plays, regardless of whether you’re home or away.”

The Celtics, who are at their best when they're defending and getting up more shots than their opponents, were 10 of 29 from beyond the arc.

“We lost our offensive purpose,” Celtics coach Joe Mazzulla said.

The tip-off of the series marked the third time in four seasons that the Heat and Celtics have met in this round. Boston won last year’s matchup in seven games.

Wednesday’s opener felt every bit like a continuation of that most recent meeting. Boston dominated inside early on and led by nine at halftime.

Spoelstra said his team was “more intentional” over the final 24 minutes.

Miami took a page out of the Celtics' book and used a 13-1 run to quickly erase that gap, tying the game at 78 in the third quarter. During the next timeout Mazzulla was captured by broadcast cameras throwing a clipboard in frustration.

Boston couldn't stop the onslaught and Miami then nudged back in front as Butler penetrated to create opportunities for his teammates.

The Heat outscored the Celtics 46-25 in the period and took a 103-91 lead into the fourth, prompting a few boos from the TD Garden crowd.

Boston responded, scoring the first seven points of the final period before a 3-pointer by Vincent ended the run.

Miami led 114-109 with just over three minutes to play when Brogdon was fouled by Butler. But he connected on just 1 of the 2 free throws. Butler was trapped on the next Miami possession before finding Martin for a corner 3.

Tatum travelled, giving the ball back to the Heat. A Miami miss gave the ball back to Boston, but Tatum was called again for travelling.

Miami wound the shot clock down before getting a 3-pointer by Butler to rattle in with 1:03 remaining.

But everything changed in the second half.

“We are just playing really good basketball,” Butler said. “More than anything, we are staying together through the good and through the bad.”

ROAD WARRIORS

The Heat are the fifth team to open with road wins in each of their first three series, joining the 2021 Hawks, 1999 Knicks, 1989 Bulls and 1981 Rockets. The Knicks were the only other No. 8 seed to make the conference finals.

TIP-INS

Heat: Miami's previous high in the playoffs was 43 points in a quarter against Charlotte in 2016. … Lowry hit 5 of his first 6 shots, scoring 13 points in his first nine minutes of action. … Butler (12) and Adebayo (6) combined for 18 of Miami’s 28 points in the first quarter. It marked the seventh time Butler has reached double figures in the first period this postseason.

Celtics: Marcus Smart finished with 13 points and 11 assists. … Led 66-57 at halftime. With the score tied at 47, Boston outscored Miami 19-10 over the final 5:26 of the half. … Brown wore his black protective mask after going without it for the final two games of their semifinals matchup with the 76ers. He fractured a facial bone late in the regular season. … New England Patriots coach Bill Belichick was in attendance.

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