Spiders held UMass to season-low 30.4 percent from the field.
Saturday marks the team's annual Pink Day for Breast Cancer Awareness.
Richmond (11-10, 3-6) pulled to within one possession in the final seconds, but could not overcome George Mason (8-14, 2-7), 78-74, on Wednesday night at the Robins Center.
Richmond faces George Mason on Wednesday night at 7 p.m.
The Spiders' home game on Saturday against Massachusetts sold out.
Lots of actitivies planned for fans at this week's MBB games
The Spider Sportsline with Coach Chris Mooney airs Monday 5:30-6:30pm from Joe's Inn Bon Air.
Four players reached double figures, including 18 points from T.J. Cline, but St. Bonaventure used a big second half to claim an 84-68 win over Richmond at the Reilly Center on Sunday afternoon.
The Spiders travel to play at St. Bonaventure on Sunday, Jan. 31 at 3 p.m.
Harper has averaged over 20 points per game in his last eight contests.
Jones, Wood combine for 51 as Spiders end Colonials' home-court winning streak
The Spiders travel to George Washington for a Thursday night battle in Foggy Bottom.