United faced a 3-1 deficit in the second half before Christian Gomez scored in the 63rd minute. Marshall then made the costly mistake that boosted United two points ahead of Chicago for the lead in the Eastern Conference.
That gave Seattle a 2-1 lead in first-half stoppage time, after which Fredy Montero scored his sixth goal of the season in the 57th minute to give the Sounders a two-score lead.
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