The Miami Heat poured it on in the fourth quarter to beat the Boston Celtics 125-113 on Sunday and book a National Basketball Association Finals showdown with the Los Angeles Lakers. 

The Heat, NBA champions in 2006, 2012 and 2013, reached the championship series for the sixth time in club history with a 4-2 overall victory over the Celtics in the Eastern Conference Finals in the NBA's quarantine bubble in Orlando, Florida. 

Bam Adebayo had a career-high 32 points and 14 rebounds, Tyler Herro came alive with 11 points in the fourth quarter in Game 6. 

Jimmy Butler added 22 points, Herro had 19 and Andre Iguodala scored a season-high 15 as the Heat advanced to the Finals for the first time since 2014.  

"A great series. It was so competitive," Heat coach Erik Spoelstra said. "I mean, in many ways, this was a seven-game series, just how competitive it was. Extremely well-coached and well-put together and we are just honored to be a part of that type of series in the conference finals, and then we get an opportunity for the next stage. Our guys will look forward to it. We're going to try to enjoy it for a night."

The Heat erased a six-point deficit in the fourth when Herro nailed a three-pointer and added another bucket to tie the score at 96 with 7min 40sec remaining. Miami pulled ahead 104-102 with 5:31 left as Daniel Theis fouled out for Boston, Adebayo hitting one of two at the line. 

That free throw kicked off a 13-0 run to put the game away for the Heat. Herro gave Miami the game's first double-digit lead at 112-102 with 3:31 to go, and the score was 116-102 before the Celtics snapped a nearly four-minute scoring drought. Boston got no closer than 10 down the stretch. 

"Miami deserves a lot of credit," Celtics coach Brad Stevens said. "They're super physical, super tough, very, very savvy. I think they're the best team in the East and deserve to be representing the East in the way that they have played."

Game 1 of the NBA Finals begins on Wednesday. 

(With input from agencies)