Seaborn was 4 of 9 from the floor with two 3-pointers for Monmouth (5-3, 1-1 Metro Atlantic Athletic Conference). Deon Jones scored 11 points with six rebounds.
Niagara (3-6, 1-1) was led by Emile Blackman with 14 points on 6-of-14 shooting.
Neither team did well beyond the arc - Monmouth was 3 of 16, Niagara went 4 for 24.
Monmouth scored the first eight points of the game and led 14-3 midway through the first half. Matt Scott's jumper drew Niagara to within six, but Monmouth outscored its host 13-7 the rest of the half and led 27-15 at the break.
The teams picked up the pace in the second half, but Niagara was unable to close the gap.