Chicago struggled to get things going early against Mariners starter Bryce Miller, who threw 5 2/3 scoreless innings with seven strikeouts.
Bryan Woo (4-2) pitched six shutout innings for the Mariners.
The Sounders fall to 4-1-1 at home and L.A. improves to 3-3-2 on the road.
Mariners third baseman and top prospect Colt Emerson made his major league debut and reached base for the first time.
The White House has not released details of the deal, and the company itself has not commented.
Luis Castillo (1-4) earned his first win of the year.
The Sounders (7-1-3) are third in the Western Conference with 24 points.
J.P. Crawford and Luke Raley hit solo home runs for the Mariners.
It’s Seattle’s ninth straight win over the Astros, which extends a franchise record.
Seattle’s Cal Raleigh went 0 for 4 to make last year’s AL MVP runner-up 0 for 36 since his last hit on April 27.
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