Seaborn was just 4 of 12 from the floor, but went 10 of 12 at the line for the Hawks (11-4, 3-1 Metro Atlantic). Chris Brady had 16 points and 13 rebounds, Justin Robinson scored 15 and Deon Jones added 11.
Seaborn's late first-half 3-pointer helped Monmouth lead 37-35 at intermission. A seven-point run midway through the second put Monmouth up by double-digits.
Monmouth's last 18 points all came at the free throw line in the last three minutes of the game.
Quinnipiac committed 33 fouls and Monmouth was 38 of 50 from the line.