Atlanta United 3, D.C. United 2

ATLANTA — In a quiet locker room after another defeat, this one by a 3-2 count to Atlanta United on Sunday, D.C. United players gathered around smartphones to watch where things had gone so terribly wrong after the last-place club twice had taken the lead.

D.C. ended a five-game scoreless streak — its longest in 20 years — but the defense failed to prevent crosses and close down space. It lost track of attackers and didn’t mark well, resulting in three goals headed in from close range.

All the scoring occurred in a 22-minute stretch of the second half. Morrison scored a wonder goal, but Atlanta equalized two minutes later. Ola Kamara, who replaced injured star Taxi Fountas, restored the lead,…