The Redhawks (1-1) were led by Nate Robinson who made four 3-pointers and scored 17 points. Riley Grigsby added 12 points, Darrion Trammel scored 11 points with seven assists and Viktor Rajkovi had 10 points and eight rebounds.
With WSU leading by three points at halftime, Gueye opened the second half with a dunk. That began a 14-3 run that left the Cougars ahead 49-35 less five minutes into the half.
Jackson had six straight points in under two minutes to keep the lead in double figures before the Redhawks got within nine on a basket by Rajkovi.