Down 25-24 at the break, Ohio opened the second half with a 23-12 run to take a 47-37 lead with 12:18 remaining. Northern Illinois then went nearly nine minutes without scoring, allowing the Bobcats to stretch their lead to 62-40 with 3:47 left.
Kellogg was 6 of 8 from the floor and hit four of five 3-pointers. Ndour made all four free throw attempts, and grabbed eight rebounds.
Ohio (13-4, 3-1 Mid-American) has won ten of its last 11 league road games, its best in program history.