Isaiah Brock's dunk with 10:22 remaining gave Oakland (8-1) a 61-37 lead that was never threatened. James McGee's free throw with 22 seconds remaining marked the only time Southern Utah (2-6) faced a single-digit deficit (77-68) after halftime.
Walker made back-to-back 3s giving the Grizzlies a 10-7 lead they'd never surrender. Ivan Madunic's 3 brought the Thunderbirds to within 28-24 with 3:33 before halftime before Oakland went on a 10-0 spurt to close the half.
Randy Onwuasor had 21 points and eight rebounds for Southern Utah.
Oakland holds an 18-14 edge in the all-time series between the two teams.