Washington State gave up a 4-spot to ASU in the fourth and never recovered.
The Cougs tied the game 1-1 in the home half of the second. But Arizona State scored two earned runs, and two unearned, on four hits to chase Tanner Chleborad (4-7) in the fourth.
The Cougars closed within 5-3 in the fifth on Yale Rosen's fifth homer of the season, a two-run shot off the flag pole beyond the right field wall. But WSU would not score again.
The Sun Devils added an insurance run in the ninth off reliever Matt Bower, who was making a Cougar single-season record 31st appearance of the season.
The Cougs could never quite get that clutch hit all season, could never quite get that third out before the damage was done, could never quite get over the hump to take a three-game series when they had their chances.
Washington State finishes the season with a 24-30 record overall. The Cougs went 14-16 in Pac-12 play.
Cougs' final loss of season has familiar feel
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