Ryan Walker joins teammate Joe Pistorese as Pitcher of the Week recipients this season.
Cougars see series-winning streak snapped at four.
Washington State collected 12 hits in a 5-3 victory over Arizona.
Game two of the series is set for 2 p.m. Saturday.
WSU enters the weekend having won its last three Pac-12 series.
Sophomore reliever picks up his WSU-record 25th career save.
WSU to square off against Huskies in nonconference game, Monday, April 27 at 7 p.m.
The Cougars win their third-straight Pac-12 Conference series.
Joe Pistorese worked seven innings and WSU scattered seven hits but the effort was not enough.
Ben Roberts' two-run double highlighted a five-run, fifth inning as Washington State defeated Utah 10-3 in the Pac-12 series opener Friday at Smith's Field.
WSU has won each of its last two Pac-12 series.
WSU completes nine-game homestand with 7-2 record.