West Virginia had its lowest-scoring output in a win under coach John Beilein and its fifth-straight victory to open a season under him.
The Mountaineers lost four of five starters from the team that made consecutive NCAA tournament runs. They have nine freshmen to help carry the load but saw rookie mistakes and poor shooting in the opener.
West Virginia shot just 17-for-57 (29.8 percent) from the field.
West Virginia led 30-27 early in the second half before Da'Sean Butler scored seven of his 11 points off the bench during a 10-2 run that pushed the advantage to 40-29 with 12:39 left.
Mount St. Mary's answered with a 9-2 run to pull within 46-40 with 2:20 left but got no closer. Butler made both free throws of a bonus situation and the Mount never threatened again.
Markus Mitchell had nine points to lead Mount St. Mary's.
Virginia Tech 94, Coppin State 43 -- Zabian Dowdell scored 16 points, A.D. Vassallo added 15 and the host Hokies scored enough points in the first half to beat the Eagles in the season opener for both teams. Tywain McKee led Coppin State with 10 points.
Navy 73, Loyola 61 -- The Midshipmen overcame a 13-point deficit by making 20 of 20 free throws and out-rebounding the Greyhounds 20-9 in the first round of the 2K Sports College Hoops Classic benefiting Coaches vs. Cancer in Queens, N.Y.
George Washington 72, UMBC 58 -- Kenan Cole led five double-digit scorers and the host Patriots (1-0) got past the Retrievers (0-1). Kristin Drabyn had 13 points for UMBC.
Columbia 75, Loyola 69 -- Jill Glessner led all scorers with 19 points in a losing effort for the visiting Greyhounds (0-1). The Lions (1-0) led by one at the half, 26-25.