Miami outscored Atlanta 18-4 in overtime as the Heat won 135-121 over the Hawks.
The Heat are now 11-0 at home and lie in third in the Eastern Conference, while the Hawks are stuck in 13th.
With 7.7 seconds left on the clock, Charlotte forward Miles Bridges scored a three-pointer that secured the win.
The Wizards have now lost three straight and are in 12th place in the Eastern, while the Hornets (10-16) are 10th.
Philadelphia remain unbeaten at home after winning 97-92 over the Denver Nuggets.
Joel Embiid got 22 points and 10 rebounds for Philadelphia.
The Sixers (18-7) have won three consecutive games, seven out of eight, are 13-0 at home and are fourth in the Eastern.
Denver (14-8) have lost five of their last six games and lie fifth in the Western Conference.
In Portland, the Trail Blazers trounced the Knicks 115-87, with Damian Lillard getting 31 points, six assists and two rebounds
The Knicks (4-20) lived up to their standing as the worst team in the NBA and have now lost 10 straight games.
The win leaves Portland (10-15) in 11th place in the Western.