The Miami Heat progressed to the Eastern Conference Finals on Thursday, comfortably defeating the Philadelphia 76ers 99-90.

After the Golden State Warriors' anaemic performance in a closeout game on the road, the Heat showed no such trepidation and led by 20 at one stage, taking control in the third quarter with a 16-2 scoring run.

Jimmy Butler scored 14 points on six-of-nine shooting in that period as Miami put the proverbial foot on Philadelphia's throat, finishing with 32 points, eight rebounds and four assists against his former team.

James Harden went missing in the second half with Philadelphia's season on the line, meanwhile, taking only two shot attempts for the half while committing three turnovers to go with his four assists.

Now in their second ECF in three seasons, the Heat will face the winner of the series between the Boston Celtics and Milwaukee Bucks.

Mavs take Suns to deciding game

The Dallas Mavericks are taking the Western Conference's first seed to seven games, after they blew the Phoenix Suns out 113-86.

Luka Doncic was very close to a triple-double with his side's season on the line, but his fingerprints were nevertheless all over Game 6, finishing with 33 points, 11 rebounds and eight assists.

Doncic's ability to find his teammates for open looks has been consistent in the series but their ability to knock them down has fluctuated. On Thursday, the Mavs shot 41 per cent from the perimeter for the win.

Devin Booker went two-of-10 with the game in the balance in the second and third quarters, as the Suns hoped to close the series out, finishing with 19 points on six-of-17 shooting.

Phoenix simply did not take care of the basketball, coughing it up 22 times with the Mavs scoring 29 points in transition off those turnovers.