Celtics guard Jaylen Brown drives to the basket against Heat forward Caleb Martin during Boston’s 122-92 win on Monday in Boston. Charles Krupa/Associated Press

BOSTON  — Jaylen Brown had 29 points, Jayson Tatum added 20 points and 12 rebounds and the Boston Celtics rolled past the Miami Heat 122-92 on Monday night.

Boston led by as many as 32 on its way to claiming its fourth victory in five outings. Marcus Smart added 16 points and seven assists.

It was Brown’s fourth consecutive game with 25 or more points, and Tatum has scored 20 or more in his last six games.

The Celtics’ onslaught was keyed on the defensive end, where they forced 18 turnovers.

“We’re still working on some things, but I’m very encouraged by the progress of our group,” said Celtics big man Al Horford, who contributed 14 points and nine rebounds. “Now we can kind of see what we can do and who we are.”

Miami has lost two straight and struggled mightily without several key players in the first of its six-game trip: Jimmy Butler (toe), P.J. Tucker (knee) and point guard Kyle Lowry, who missed his eighth consecutive game for personal reasons.

In their absence, Max Strus finished 27 points. Caleb Martin had 14 points and Bam Adebayo chipped in 12 points, five rebounds and five assists. Miami also was coming off a triple-overtime loss to Toronto on Saturday.

“We played about seven good minutes of basketball. The rest of it I would love to just put in a dumpster truck,” Heat Coach Erik Spoelstra said. “It was just uncharacteristic for us. But we’ve been through a bunch of stuff in the last 72 hours.”

The Celtics connected on eight of their first 11 shots and jumped to a 21-7 lead. Miami struggled for quality looks on its end of the floor, shooting just 29% (6 of 21) in the opening quarter.

The Heat settled down, starting the second quarter on an 18-5 run to tie the game at 32. It prompted Celtics Coach Ime Udoka to call a timeout. His team immediately responded with seven straight points to key a 22-13 run to close the half.

Udoka said the team heeded his message to limit the open looks for Miami’s shooters.

“We got our physicality back,” Udoka said. “Credit to our guys. They bounced back and finished out the half, then carried it over to the third quarter.”

Boston led 67-52 in the third when Adebayo was assessed a technical at the 8:38 mark and pulled from the game by Spoelstra. By the time Adebayo returned with 2:04 left in the period, Boston’s lead had grown to 86-67. The Celtics took a 94-70 edge into the fourth and cruised the rest of the way.

Smart said he feels like the team is finding its way after some rough patches earlier in the season.

“I love it, especially with the adversity that we’ve been dealing with this whole season – the up and down, not being consistent,” Smart said. “For us to finally make start to make that walk in the right direction, it’s big for us. …. It’s something that we needed. It’s happening at the right time for us.”