Celtics beat Heat in Game 5 to extend Eastern Conference finals

The Boston Celtics have looked elimination in the face four times this postseason and still haven’t blinked.

Derrick White had 24 points, including six three-pointers, and the Celtics dominated the Miami Heat 110-97 on Thursday night in Game 5 to extend the Eastern Conference finals.

Marcus Smart had 23 points and five steals. Jayson Tatum and Jaylen Brown finished with 21 points apiece as the Celtics won their second straight and trimmed Miami’s series lead to 3-2. The Celtics are halfway to becoming the first team in NBA history to overcome a 3-0 deficit to win a series.

“We’ve got to do whatever it takes to get a win,” White said.

Boston also survived two elimination games in the second round against the 76ers. Teams that fell behind 3-0 are 0-150 all-time in series.

“It just says that our backs are against the wall and we’re sticking together and we’re competing at a high level to give ourselves a chance,” Celtics coach Joe Mazzulla said.

Game 6 is Saturday in Miami.

“We’re always going to stay positive, knowing that we can and we will win the series,” the Heat’s Jimmy Butler said. “We just have to close it out at home.”

A day after the Florida Panthers punched the franchise’s first ticket to the Stanley Cup Finals since 1996, for the second straight game the Heat were denied a spot in the NBA Finals.

“One game doesn’t lead to the next game,” Heat coach Erik Spoelstra said. “It just doesn’t matter. It’s about collectively preparing and putting together a great game. We’ll play much better on Saturday. That’s all we just have to focus on right now.”

Duncan Robinson led the Heat with 18 points. Bam Adebayo added 16 points and eight rebounds. Butler had 14 points, five rebounds and five assists, but sat out the final 9:47 of the game. Caleb Martin finished with 14 points.

It was Butler’s lowest-scoring game of the playoffs. He had 16 points in Game 3, a blowout win by Miami.

Miami never led and had 16 turnovers.

“I don’t want to say we’re surprised by it, but they raised their level,” Robinson said. “We’ve got to raise ours now as well.”

Boston entered the day just 4-5 at TD Garden this postseason. But with a raucous home crowd behind them, the Celtics thrived on their energy.

They dove for loose balls, outfought Miami for rebounds and found each other for layups and dunks in transition as they built as much as a 20-point lead in the first half.

The Heat cut into it, but Boston kept knocking down threes and grew its edge as high as 96-72 in the fourth quarter.

Boston’s fans reignited a “Beat the Heat!” chant that hadn’t been prevalent since Game 1.

The Heat started Kyle Lowry at point guard after Gabe Vincent was ruled out with a sprained left ankle earlier in the day. It was Lowry’s first start since Feb. 2.

Vincent, the Heat’s third-leading scorer this postseason, got hurt late in Miami’s Game 4 loss when he landed awkwardly while trying to save a loose ball near the Heat bench.

His presence was missed as Miami struggled early on the offensive end, swarmed by a Celtics defense that forced the Heat into 10 first-half turnovers that led to 17 Boston points. Lowry played 31 minutes, scored five points and finished with four turnovers.

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