Wilmington (4-8), conversely, shot 39.3 percent (22 of 56) from the field, including five straight misses during a 15-0 Miami run over a 2 minute, 23 second span in the second half.
Harris capped the run with a 3-pointer and Johnson added two free throws to give Miami a 69-55 lead with 9:53 left to play.
Wilmington, which led five times, never got any closer as the Quakers missed 14 of their last 18 shots.
Brandon Candella led Wilmington with 16 points.
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