Johnson, who came in averaging 16.9 points for the Dukes (5-3), scored eight points during an 18-5 Duquesne run in the opening 4:39 of the second half that widened a 32-28 halftime lead to 50-33. The junior guard made 8 of 12 shots and was 7 of 7 from the free-throw line.
Monteiro, a senior swingman, scored 14 of his points in the first half, in which Duquesne never trailed after opening a 7-0 lead. After the Golden Eagles (3-4) rallied for a 14-14 tie with 11:22 remaining, Monteiro scored the next four points.
Duquesne shot 50 percent (13 of 26) in each half.