Jaylen Brown scored a season-high 31 points, Kemba Walker had 28 and the Boston Celtics beat the Miami Heat 112-93 on Wednesday night.

Jayson Tatum added 19 points to help Boston improve to 8-0 at home. Brown connected on a season-high six 3-pointers, and Walker had seven assists and four rebounds.

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Boston Celtics center Robert Williams III (44) reaches for a rebound during the first half of an NBA basketball game against the Miami Heat in Boston, Wednesday, Dec. 4, 2019. (AP PhotoCharles Krupa)

Jaylen Brown scored a season-high 31 points, Kemba Walker had 28 and the Boston Celtics beat the Miami Heat 112-93 on Wednesday night.

Boston Celtics forward Jayson Tatum (0) drives to the basket against Miami Heat center Bam Adebayo (13) during the first half of an NBA basketball game in Boston, Wednesday, Dec. 4, 2019. (AP PhotoCharles Krupa)

Heat coach Erik Spoelstra left the team in the morning, flying home to be with wife Nikki for the birth of their second son. Assistant coach Dan Craig ran the team.

Boston Celtics head coach Brad Stevens prepares to draw up a play during a time out in the first half of an NBA basketball game against the Miami Heat in Boston, Wednesday, Dec. 4, 2019. (AP PhotoCharles Krupa)

Brown later banked in a 3 from the top of the key, making it 102-79 with 5:16 to play.

Miami Heat forward Jimmy Butler, right, is covered on his shot by Boston Celtics guard Javonte Green (43) and forward Jaylen Brown, rear left, during the first half of an NBA basketball game in Boston, Wednesday, Dec. 4, 2019. (AP PhotoCharles Krupa)

Celtics: Guard Marcus Smart missed the game due to illness. Coach Brad Stevens said he would have been “doubtful” with a sore oblique, but “the illness knocked him out” of playing.

Miami Heat forward Jimmy Butler (22) fires a shot over Boston Celtics center Enes Kanter (11) during the first half of an NBA basketball game in Boston, Wednesday, Dec. 4, 2019. (AP PhotoCharles Krupa)

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Miami Heat forward Jimmy Butler, left, battles for the loose ball against Boston Celtics guard Kemba Walker, right, during the first half of an NBA basketball game in Boston, Wednesday, Dec. 4, 2019. (AP PhotoCharles Krupa)

Miami Heat forward Jimmy Butler, left, battles for the loose ball against Boston Celtics guard Kemba Walker, right, during the first half of an NBA basketball game in Boston, Wednesday, Dec. 4, 2019. (AP PhotoCharles Krupa)

Boston Celtics guard Kemba Walker (8) drives to the basket against Miami Heat guard Kendrick Nunn (25) during the first half of an NBA basketball game in Boston, Wednesday, Dec. 4, 2019. (AP PhotoCharles Krupa)

Boston Celtics guard Kemba Walker (8) drives to the basket against Miami Heat guard Kendrick Nunn (25) during the first half of an NBA basketball game in Boston, Wednesday, Dec. 4, 2019. (AP PhotoCharles Krupa)

Boston Celtics forward Daniel Theis (27) drives to the basket against Miami Heat forward Meyers Leonard (0) during the first half of an NBA basketball game in Boston, Wednesday, Dec. 4, 2019. (AP PhotoCharles Krupa)

Boston Celtics forward Daniel Theis (27) drives to the basket against Miami Heat forward Meyers Leonard (0) during the first half of an NBA basketball game in Boston, Wednesday, Dec. 4, 2019. (AP PhotoCharles Krupa)

Miami Heat assistant coach Dan Craig, who was filling in for head coach Erik Spoelstra, calls to players during the first half of an NBA basketball game against the Boston Celtics in Boston, Wednesday, Dec. 4, 2019. (AP PhotoCharles Krupa)

Miami Heat assistant coach Dan Craig, who was filling in for head coach Erik Spoelstra, calls to players during the first half of an NBA basketball game against the Boston Celtics in Boston, Wednesday, Dec. 4, 2019. (AP PhotoCharles Krupa)

Boston Celtics center Enes Kanter (11) looks to pass as he is covered by Miami Heat forward Kelly Olynyk, right, during the first half of an NBA basketball game in Boston, Wednesday, Dec. 4, 2019. (AP PhotoCharles Krupa)

Boston Celtics center Enes Kanter (11) looks to pass as he is covered by Miami Heat forward Kelly Olynyk, right, during the first half of an NBA basketball game in Boston, Wednesday, Dec. 4, 2019. (AP PhotoCharles Krupa)

Jimmy Butler led the Heat with a season-high 37 points and had six rebounds and four assists. Former Celtic Kelly Olynyk added 12 points, and Duncan Robinson and Justise Winslow each had 10. Miami had won three in a row.

Boston Celtics center Robert Williams III (44) reaches for a rebound during the first half of an NBA basketball game against the Miami Heat in Boston, Wednesday, Dec. 4, 2019. (AP PhotoCharles Krupa)

Boston Celtics center Robert Williams III (44) reaches for a rebound during the first half of an NBA basketball game against the Miami Heat in Boston, Wednesday, Dec. 4, 2019. (AP PhotoCharles Krupa)

Heat coach Erik Spoelstra left the team in the morning, flying home to be with wife Nikki for the birth of their second son. Assistant coach Dan Craig ran the team.

Brown hit two 3-pointers and Semi Ojeleye had one — all coming from the left corner directly in front of the Heat bench just over a minute apart — during a 9-1 spurt that pushed Boston’s lead to 80-67 late in the third quarter. The Celtics led by 13 after three quarters.

Boston then scored the first seven points of the fourth, making it 89-69 on Carsen Edwards’ 3 from the right wing.

Boston Celtics forward Jayson Tatum (0) drives to the basket against Miami Heat center Bam Adebayo (13) during the first half of an NBA basketball game in Boston, Wednesday, Dec. 4, 2019. (AP PhotoCharles Krupa)

Boston Celtics forward Jayson Tatum (0) drives to the basket against Miami Heat center Bam Adebayo (13) during the first half of an NBA basketball game in Boston, Wednesday, Dec. 4, 2019. (AP PhotoCharles Krupa)

Brown later banked in a 3 from the top of the key, making it 102-79 with 5:16 to play.

TIP-INS

Heat: Craig spent his high school years living about 40 minutes away from TD Garden in Chelmsford and rooting for the Celtics. “It worked out kind of funny,” he said. “I’m back home and I’m going to coach this game. It’s pretty exciting.” Craig also ran the team in March of 2018 when Spoelstra was away for the birth of his first son. The Heat also lost that game.

Boston Celtics head coach Brad Stevens prepares to draw up a play during a time out in the first half of an NBA basketball game against the Miami Heat in Boston, Wednesday, Dec. 4, 2019. (AP PhotoCharles Krupa)

Boston Celtics head coach Brad Stevens prepares to draw up a play during a time out in the first half of an NBA basketball game against the Miami Heat in Boston, Wednesday, Dec. 4, 2019. (AP PhotoCharles Krupa)

Celtics: Guard Marcus Smart missed the game due to illness. Coach Brad Stevens said he would have been “doubtful” with a sore oblique, but “the illness knocked him out” of playing.

LEAD ERASED

The Heat led by 11 points midway into the second quarter before the Celtics closed the half by scoring 26 of the final 33 points. Walker had nine of the points and Tatum eight in the spree over the final 7:09, including two shots from beyond the arc.

Miami Heat forward Jimmy Butler, right, is covered on his shot by Boston Celtics guard Javonte Green (43) and forward Jaylen Brown, rear left, during the first half of an NBA basketball game in Boston, Wednesday, Dec. 4, 2019. (AP PhotoCharles Krupa)

Miami Heat forward Jimmy Butler, right, is covered on his shot by Boston Celtics guard Javonte Green (43) and forward Jaylen Brown, rear left, during the first half of an NBA basketball game in Boston, Wednesday, Dec. 4, 2019. (AP PhotoCharles Krupa)

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Heat: Host Washington on Friday night.

Celtics: Host Denver on Friday night.

More AP NBA: https://apnews.com/NBA and https://twitter.com/AP_Sports

Miami Heat forward Jimmy Butler (22) fires a shot over Boston Celtics center Enes Kanter (11) during the first half of an NBA basketball game in Boston, Wednesday, Dec. 4, 2019. (AP PhotoCharles Krupa)

Miami Heat forward Jimmy Butler (22) fires a shot over Boston Celtics center Enes Kanter (11) during the first half of an NBA basketball game in Boston, Wednesday, Dec. 4, 2019. (AP PhotoCharles Krupa)

Miami Heat forward Jimmy Butler, left, battles for the loose ball against Boston Celtics guard Kemba Walker, right, during the first half of an NBA basketball game in Boston, Wednesday, Dec. 4, 2019. (AP PhotoCharles Krupa)

Miami Heat forward Jimmy Butler, left, battles for the loose ball against Boston Celtics guard Kemba Walker, right, during the first half of an NBA basketball game in Boston, Wednesday, Dec. 4, 2019. (AP PhotoCharles Krupa)

Boston Celtics guard Kemba Walker (8) drives to the basket against Miami Heat guard Kendrick Nunn (25) during the first half of an NBA basketball game in Boston, Wednesday, Dec. 4, 2019. (AP PhotoCharles Krupa)

Boston Celtics guard Kemba Walker (8) drives to the basket against Miami Heat guard Kendrick Nunn (25) during the first half of an NBA basketball game in Boston, Wednesday, Dec. 4, 2019. (AP PhotoCharles Krupa)

Boston Celtics forward Daniel Theis (27) drives to the basket against Miami Heat forward Meyers Leonard (0) during the first half of an NBA basketball game in Boston, Wednesday, Dec. 4, 2019. (AP PhotoCharles Krupa)

Boston Celtics forward Daniel Theis (27) drives to the basket against Miami Heat forward Meyers Leonard (0) during the first half of an NBA basketball game in Boston, Wednesday, Dec. 4, 2019. (AP PhotoCharles Krupa)

Miami Heat assistant coach Dan Craig, who was filling in for head coach Erik Spoelstra, calls to players during the first half of an NBA basketball game against the Boston Celtics in Boston, Wednesday, Dec. 4, 2019. (AP PhotoCharles Krupa)

Miami Heat assistant coach Dan Craig, who was filling in for head coach Erik Spoelstra, calls to players during the first half of an NBA basketball game against the Boston Celtics in Boston, Wednesday, Dec. 4, 2019. (AP PhotoCharles Krupa)

Boston Celtics center Enes Kanter (11) looks to pass as he is covered by Miami Heat forward Kelly Olynyk, right, during the first half of an NBA basketball game in Boston, Wednesday, Dec. 4, 2019. (AP PhotoCharles Krupa)

Boston Celtics center Enes Kanter (11) looks to pass as he is covered by Miami Heat forward Kelly Olynyk, right, during the first half of an NBA basketball game in Boston, Wednesday, Dec. 4, 2019. (AP PhotoCharles Krupa)