Washington 67, N. Illinois 57
Wilcox topped the 20-point mark for the seventh time in eight games. Aziz N'Diaye added 13 points and 12 rebounds for his fourth double-double of the season.
Washington led 36-25 at halftime.
Sophomore Abdel Nader came off the bench to lead Northern Illinois (2-9) with 18 points, while Keith Gray added 10.
Troubled by inconsistent play during the nonconference portion of its schedule, Washington (8-4) has now won four straight games.