UMass (15-4, 5-1), which beat UD in the A-10 championship game last season to win the tournament for the first time, has won four games in a row. It began the day a game behind Rhode Island (15-3, 6-0).
Mariah Perez led Dayton with 15 points on 5-of-8 shooting. Destiny Bohanon added 14 points, and Sydney Freeman scored 13.
Sydney Taylor, who averages 15.4 points per game, scored 30 for UMass.
Dayton returns to action at 7 p.m. Wednesday against Duquesne (13-6, 3-3) at UD Arena.
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