WSU starter Travis Cook walked the first three batters of the game and then hit Riccio Torrez with a pitch to force in a run.
The bases were still loaded and nobody out, but Zach Wilson grounded into a double play, allowing a run to score but negated a bigger inning.
Unlike Friday night, ASU didn't give those runs back in the bottom of the first, instead they built on their lead.
An RBI single by Zack MacPhee in the second and an RBI double by Wilson in the third made it 4-0 Sun Devils.
The Cougars (16-11, 2-3) got on the board against ASU starter Merrill Kelly in the fourth inning on a sacrifice fly by Michael Weber.
ASU failed to build on that lead by hitting into an inning ending double play with the bases loaded in the fourth and wasting a leadoff double in the fifth inning.
However, those opportunities didn't loom as large after the sixth inning, when ASU scored six times to grab a 10-1 lead.
Raoul Torrez and Andrew Aplin started the inning with base hits, but it looked like another wasted opportunity when Drew Maggi hit into a double play.
MacPhee made sure this chance didn't go by the wayside by launching his second home run of the series and his fifth big fly of the season.
Following the homer, back-to-back doubles Kole Calhoun and Riccio Torrez made it 7-1 ASU. Wilson and Johnny Ruettiger added RBI singles later in the inning and another run scored on an error by WSU second baseman Cody Bartlett.
WSU attempted to get back into the game with two runs in the bottom of the sixth, but a throwing error by Cougars' catcher Paul Clingan let another ASU run score to make it 11-3.
The Cougars added another run to make it 11-4 before things got a little interesting in the ninth. Freshman reliever Alex Blackford let up three runs, before Jake Barrett came on and got the final out to pick up his second save of the season.
Kelly allowed four runs in his seven innings of work to pick up his seventh win of the season. Josh Moody worked a scoreless inning of relief, before Blackford allowed three runs in 2/3 innings.
MacPhee and Wilson each finished 3-4 on the afternoon and MacPhee had three RBI's. Wilson and Riccio Torrez each had two RBI's.
The rubber game of the series is tomorrow afternoon at noon. Sophomore Jake Borup will get the assignment for ASU.