Willie Galick matched his career high of 17 points and grabbed 13 rebounds for the Matadors (4-7, 1-0 Big West), who have won three of four after losing six consecutive games.
Fullerton's Josh Akognon, third nationally in scoring at 25.5 points, finished with a season-low eight points. Akognon failed to score in double figures for just the fourth time in his two seasons at Fullerton.
Northridge shot 59.6 percent, a season-best 63.6 percent from 3-point range and scored 21 points off turnovers.
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point guard Melo Trimble, considered a lock to leave the program before struggling in the second half last season, has withdrawn from the NBA draft and will return for his junior season.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.