Hammond snapped a 57-all tie on a 3-pointer with 2:39 remaining. Myles Ruth made two free throws with five seconds left for the final margin.
Melik Martin added 12 points and three blocks for Monmouth (12-7, 12-6 Metro Atlantic Athletic Conference).
Monmouth totaled 24 points in the first half, a season low for the team.
Dwight Murray Jr. had 23 points and 11 rebounds for the Broncs (5-16, 5-13). Dontrell McQuarter added six rebounds.
The Hawks swept the season series, having beaten Rider 77-74 on Thursday.
The teams will take part in conference tournament which begins Monday in Atlantic City, N.J., when 11th-seeded Rider will play the sixth seed. Monmouth will be the second seed and will play on Wednesday against the winner of a Tuesday first-rounder.
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