The Bucks led for most of the way, were up by 14 in the second half, and held a 97-86 lead with nine minutes left – then watched the Atlanta Hawks come from behind for a 121-114 victory.
That broke a 10-game Hawks losing streak on the team’s home court.
Trae Young led the way with 30 points.
Milwaukee lost for the fourth time in five games despite a 34-point performance from Khris Middleton.
Point guard Jrue Holiday missed a sixth straight game.
Milwaukee had won 23 straight times when leading after the third period.
The Bucks return home to host Memphis Wednesday night.
