Shane Matheny had his second straight three hit game, finishing 3 for 4 with two runs scored and a run batted in, to help the Cougars (17-28, 10-16 Pac-12) beat the Huskies (27-18, 13-10) for the second straight time after winning the series opener on Friday night.
The home team took an early 1-0 lead in the bottom of the first inning.
Leadoff batter K.J.Brady got hit on the foot with a pitch, advanced to second on a sacrifice by Jack Meggs. Brady then scored on a line single to left by Chris Baker, who took second when left fielder Cameron Frost's throw home hit Brady and bounced to the backstop for an error.
Joey Morgan walked to put Huskies at first and second but John Naff grounded to second and M.J. Hubbs flied to left to end the inning. The Huskies would not threaten again until the bottom of the sixth.
Meanwhile, the Cougars roughed up Joe DeMers (3-4) for five runs on five hits in the top of the third.
With one out, Dugan Shirer singled to left and advanced to third on a single by Trek Stemp. The hot hitting Matheny then singled to right to score Shirer and make it 1-1. Ty Johnson followed with another single to score Stemp and put the visitors ahead 2-1. A sacrifice fly to center by Patrick McGrath plated Matheny for 3-1. A double by Weston Hatten sent DeMers to the showers in favor of Spencer Jones, who got greeted rudely by a two run single from J.J. Hancock,making it 5-1.
Starter Ian Hamilton (2-9) benefited from the offensive outburst to get the win. He went six innings, allowing two runs on five hits. He walked four and struck out four.
The second Husky run came in the bottom of the sixth with two outs. Naff roped a double to right center and scored on a line single to left center by Hubbs.
Trenton Dupre pitched the final three innings to earn his second save of the season. He gave up two singles, did not walk anyone, and struck out one.
For the Huskies, DeMers finished with two and two thirds innings, giving up five runs, all earned, on five hits. He walked one and struck out one.
Two more runs for Washington State came in the top of the seventh, charged to Jones. One run scored on a fielder's choice and the second on a throwing error by Levi Jordan.
The two teams return to Husky Ballpark for the series finale on Sunday at 12:00 pm.