Dyami Starks gave Bryant a 54-51 lead on a layup with 2:35 left and neither team scored for more than two minutes.
Byron Ashe converted a pair of free throws to pull the Mountaineers within one, 54-53, with :12 seconds left. Gregory Graves found open space in front of the basket with :04 left, but his shot for the lead wouldn't fall and Shane McLaughlin snared the rebound to seal it for Bryant. McLaughlin added a free throw for the final margin.
Graves finished with 14 points to lead Mount St. Mary's (10-12, 6-5).