Mitchell was 5 of 5 from the floor and 4 of 4 from the free throw line.
Mark Alstork led WSU with 20 points, while Steven Davis added 17 and Grant Benzinger had 15 as the Raiders (17-9, 8-5 Horizon League) won for the sixth time in eight games.
The Phoenix (15-11, 8-5 Horizon League) lost their second game in a row to fall into third place, a half game behind Oakland and a half game ahead of WSU and Northern Kentucky.
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