BYU’s only runs came when Nate Favero doubled in Brock Hale in the fifth inning and Colton Shaver hit a solo home run in the seventh. The Cougars used six pitchers, with starter Brady Corless getting the loss.
The loss drops BYU to the one-loss bracket of the double-elimination regional. The Cougars similarly lost to Loyola Marymount to open the WCC tournament before winning four straight, earning them a trip to the NCAA tournament for the first time since 2002.
Fullerton put BYU in a 3-0 hole in the first inning thanks to Cougar errors from Corless and Hale.
A two-run homer from Hunter Cullen in the third put Fullerton up 6-0, and the rout was on.
Hale finished 3 for 4 from the plate to lead the Cougars.
BYU next faces Sacramento State at 2 p.m. Friday.