Drew Barham provided 17 points off the bench as the Bulldogs (4-0) warmed up for a trip to next week's Maui Invitational with a one-sided win.
Przemek Karnowski and Gary Bell Jr. each netted 12 points.
David Stockton chipped in with nine with nine assists for Gonzaga.
The Cougars (2-1) were led by Ike Iroegbu with 20 points.
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