Monmouth (6-7, 3-0 MAAC) took the lead for good with a 9-0 run to go up 59-55 with 4:24 left. The Hawks extended to 67-60 on Austin Tilghman's free throws with 49 seconds left. Tilghman made four more free throws and Andrew Nichols added a layup to secure the win.
Tilghman and Deon Jones added 11 points each for Monmouth.
Canisius led most of the second half with its largest lead at 49-41 with 12:39 left. One of Lewis' 3s made it 55-50 with 6:54 left before the Hawks took control.