The Trail Blazers lost for the fourth time in seven games with a 93-90 setback to Milwaukee on Saturday.
Damon Stoudamire missed a potential tying 3-pointer with three seconds left for Portland, which blew a 10-point lead with seven minutes to play.
Atlanta has lost six of eight, including a 115-93 setback on Golden State on Sunday.
Atlanta shot just 33 percent from the field and allowed Golden State to connect on 46 percent.
The Hawks are just 5-23 on the road while the Blazers are 17-9 at home.
Portland edged Atlanta on the road, 112-110, in double overtime on January 22. The Blazers have won six of the last eight meetings, including three straight at home since a 99-90 defeat on December 15, 1997.