Stefan Van Horn’s two-out three-run double in the fifth was the big offensive blow.
Jones allowed just one earned run on three hits while striking out three in 5.1 innings. It was a season-high in innings for the lefthander who improved to 2-2 in his final start of the season. Walker in relief also allowed just three hits the rest of the way.
WSU received a two-hit game from senior Patrick McGrath, a stolen base and two runs scored from Justin Harrer and three RBI from Van Horn.
Jones cruised after allowing a first-inning single, retiring 11 in a row before Cal singled with one out in the fifth.
--Patrick McGrath reached on an infield single in the first to extend his on-base steak to 12 games.
--Dugan Shirer stole his 12th base of the season, tying Trek Stemp for the team lead. The Cougs lead the Pac-12 in steals.
--Derek Chapman stole his 11th base of the season.
--The series continues Saturday at 4 p.m. on the Pac-12 Networks.