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J.P. Crawford singled home the Mariners’ lone run in fifth inning.
Bryan Woo started the game with three hitless innings, but then fell apart in the fourth and was lifted at the end of the inning.
It’s unclear whether Iran’s upcoming opponent, Egypt, will also be allowed to arrive in Seattle two days early.
Infielder/outfielder Connor Joe was optioned to Triple-A Tacoma.
Andrés Muñoz pitched a perfect ninth for his 14th save.
Dominique Malonga scored a career-high 37 to go with 12 rebounds for Seattle (3-15).
Logan Gilbert (6-4) struck out eight and walked two.
Downtown Bellingham was packed as the US earned back-to-back World Cup wins for the first time since 1930.
It was a solid bounce-back outing for Woo, who gave up a career-high seven runs in five innings in a 7-5 loss at Baltimore on June 11.
There will be two official watch parties in downtown Bellingham Friday when the US plays Australia in Seattle at noon.