Atlanta United took down a surging LA Galaxy away from home, while New York City FC's unbeaten start to the season ended in Portland.
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Josef Martinez scored a first-half goal, Miguel Almiron converted a penalty, and Atlanta kept Ibrahimovic off the scoreboard.
Alexander Ring scored his first Major League Soccer goal to help New York City FC to a 2-2 draw with Atlanta United on Sunday night.
Atlanta United forward Josef Martinez is set to be fit for Sunday's match against undefeated New York FC after suffering an injury during training.
Atlanta United's star striker Josef Martinez suffered an apparent arm injury in training on Wednesday.
Week 6 was a quiet one in Major League Soccer, but Atlanta United made a lot of noise in retaining the No. 2 spot in the Power Rankings.
The Cameroon international was in attendance as Atlanta United beat Los Angeles FC 5-0 on Saturday.
Miguel Almiron scored a pair of penalties and video review played a major part in helping Atlanta United win their fourth straight game 5-0 over LAFC.
MLS record signing Ezequiel Barco is expected to be back training with Atlanta United next week after a lengthy injury layoff.
NYCFC's win over San Jose saw it reclaim the top spot in the MLS Power Rankings, while Atlanta United surged back to second.