Dyson Daniels' breakout NBA season is over, ending in a nerve-jangling, heart-breaking, over-time play-in tournament loss to the Miami Heat.

Australian guard Daniels played a big role as his Atlanta Hawks fought back in the final quarter to force extra time in Friday night's home match.

But it was the 10th-seeded Heat who triumphed 123-114 and advanced to meet eastern conference-topping Cleveland in the first round of the playoffs as the eighth-seeded Hawks bowed out after back-to-back play-in tournament losses.

The Hawks battled against intense Heat defence and trailed for most of the game.

They rallied to level at 88-88 with eight minutes to go, with the lead changing hands before Trae Young received the ball from Daniels and made a lay up with 1.3 seconds left to force overtime at 106-106.

It was all the Heat in overtime, as they won their second straight play-in road game, with Tyler Herro leading the way with his 30 points, including two 3-pointers in overtime.

It was a tough end to Daniels' third NBA season.

The 22-year-old has blossomed as a regular starter for the Hawks following his off-season trade from the New Orleans Pelicans, becoming a contender for defensive player of the year.

The Hawks had been crushed 120-95 in their opening play-in game two days earlier.

Daniels had 11 points on 5 of 13 shooting against the Heat, while also grabbing 10 rebounds, dishing four assists and matching his stellar season average with three steals.

The Heat became the first No.10 seed in either conference to make the playoffs since the current play-in format was launched in the 2020-21 season.

"I know how badly our group wanted to get into this thing," Miami coach Erik Spoelstra said. "I could see it in their eyes and feel it in their heart."

Herro got great support from Andrew Wiggins (20 points, eight rebounds, eight assists) and Bam Adebayo (17 points, 11 rebounds) while Davion Mitchell made three 3-pointers in overtime.

Hawks ace Young was heavily defended as he scored 29 points on 9-22 shooting and provided 11 assists, while centre Onyeka Okongwu excelled with 28 points and 12 rebounds and George Niang came off the bench for 20 points.

"I thought both teams played at a high level of competitiveness," said Hawks coach Snyder. "I'm very proud of our guys."

Daniels' countryman Dante Exum also missed out on playoffs action as the Dallas Mavericks succumbed 120-106 away to the Memphis Grizzlies in their western conference play-in clash.

Exum played a bit role with three points in 13 minutes coming off the bench for the Maveicks as the eighth-seed Grizzlies earned the right to play the regular season-topping Oklahoma City in the first playoffs round.

Ja Morant overcame a sprained right ankle to score 22 points and add nine assists for the Grizzlies while Anthony Davis led the Mavericks with 40 points and nine rebounds.