Donte Clark tallied 12 points to lead as many Minutemen that entered the scoring column Thursday.
Ray Bowles and Jack Williams each scored 11 points to lead all Tigers. David Taylor added eight.
UMass (6-2) was 45.5 percent (25-of-55) shooting and 38.9 percent (14-of-36) from deep. The Minutemen were 8-of-14 from the free throw line.
Pacific (3-5) shot 31.5 percent (17-of-54) from the floor and 4-of-13 from beyond the arc, extending its streak of consecutive games with at least one 3 made to 893. The Tigers were 10-of-15 from the charity stripe.