Arizona starting pitcher, Kurt Heyer (4-1), experienced his toughest outing of the season as the Cougars struck early and often, tallying one run in each of the first four innings.
The Wildcats' offense was dormant as Cougars' starting pitcher J.D. Leckenby kept them on their heels all night long.
Leckenbey forced the Wildcats to hit into ten ground ball outs and five strikeouts in 6 and 1/3 innings pitched.
The Cougars continued to pour it on in the latter part of the game. Junior lefty Vincent Littleman struggled as WSU struck for one run in the 7th inning and one more in the 8th to take a commanding 6-0 lead.
In an otherwise lack-luster effort offensively, Joseph Maggi and Johnny Field were bright spots as both were able to record multi-hit games.
Arizona only managed seven hits all night long, stranding eight base runners in a frustrating opener to the Pac-12 season.
Arizona (14-4), off to their best start to a season since 1999, will play a doubleheader on Saturday due to an approaching weather storm expected to hit Tucson on Sunday. Konner Wade (3-0 2.70 ERA) will take the mound in the first game at 1pm MST and the second game will follow at 6pm MST with James Farris (2-1 3.55 ERA) toeing the rubber.