Mason Marenco hit a grand slam, Austin Pinorini had a two-run triple and the Bulldogs (23-17, 15-6) completed a three-game sweep of the Dons (24-20, 12-9) with a third straight rout, 12-3 on Sunday, in West Coast Conference play at Patterson Baseball Complex.
Pinorini added an RBI single and Nick Nyquist had three hits and three RBIs.
Gonzaga outscored the Dons 41-14 in the series.
Gonzaga travels to Corvallis to take on No. 2 Oregon State on Tuesday at 5:35.
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