MIAMI (AP) — A week ago, the Boston Celtics beat the Miami Heat with defense. This time, they did it with offense.

Paul Pierce scored 27 points, Kevin Garnett added 24 points and nine rebounds, and the Celtics made their first eight shots of the fourth quarter to hold off the Heat 115-107 on Tuesday night.

Rajon Rondo posted double-digit assists for the 18th straight game, extending the NBA’s longest such streak in 20 years with an 18-point, 15-assist effort. Brandon Bass added 12 points and 10 rebounds, while Avery Bradley scored 11 for the Celtics, who shot a season-high 61 percent and survived two possessions where Miami could have tied the score in the final quarter.

“We talk about it in fighting terms,” Celtics coach Doc Rivers said. “We told them today before the game, you’re in a boxing match, you expect to get hit. They’re going to hit you. They did and we withstood it. I thought that was important for our team.”

LeBron James finished with 36 points, seven rebounds and seven assists for Miami, which got 20 from Dwyane Wade and 18 from Mario Chalmers. Chris Bosh finished with 13 on 5-for-13 shooting for Miami, which has gone 5-5 in its last 10 games.

Boston improved to 18-7 since the All-Star break, and dealt Miami a blow in the race for the No. 1 seed in the East. The Heat fell three games behind Chicago after the Bulls beat the New York Knicks later Tuesday night.

“It took a while,” Rondo said, “but we’re peaking at the right time.”

A layup by Wade got Miami within 108-103 with 2:22 left, before Garnett made a high-arcing jumper that dropped softly through the net, his 11th make in 14 shots.

That pretty much described the night. Whenever Miami got close, the Celtics found a way to hold them off.