Cressler, a freshman guard, came off the bench to shoot 6-of-8 from 3-point range. Cornell's bench outscored Western Michigan's 35-14.
Miller, last season's Ivy League Rookie of the Year, also came up with nine points and three steals for the Big Red, whose pressure defense limited the Broncos to 1-of-13 shooting to open the game and 30.4 percent shooting (17 of 56) overall. Cornell's blocked shot total was one shy of its school record.
Maryland point guard Melo Trimble, considered a lock to leave the program before struggling in the second half last season, has withdrawn from the NBA draft and will return for his junior season.
Louisville's Chinanu Onuaku, who recently underwent a medical procedure to correct a heart rhythm issue detected during the combine, will keep his name in the NBA draft pool.
Andrew White III will return to the Nebraska men's basketball team next season after removing his name from the NBA draft.