Seattle jumped on the Fire early and predictably punished the backline during a 4-2 victory for the visitors at SeatGeek Stadium. Jordan Morris beat Nicolas Hasler to the endline to find Victor Rodriguez for an easy tap-in eight minutes into the match.
Seattle double their lead in the 15th minute on a beautiful pass and finish by Nicolas Lodeiro and Morris, who had slipped behind Johan Kappelhof and Hasler.
They made it 3-0 in the 49th when Lodeiro converted a penalty kick following a foul in the box committed by Marcelo against Rodriguez.
The Fire made a game of it briefly when Raheem Edwards headed in a pass from CJ Sapong in the 57th and Fabian Herbers followed up his own shot to make it 3-2 in the 84th.
Raul Ruidiaz beat David Ousted and Bastian Schweinsteiger to a ball in front of the net four minutes after Herbers' goal to seal the win for Seattle.
Ousted; Hasler (Edwards 35'), Kappelhof, Marcelo, Campos (Bronico 46'); Schweinsteiger, McCarty; Frankowski, Mihailovic, Sapong; Nikolic (Herbers 71')
Subs not used: Sanchez, Lillard, Moreno, Martinez
Ousted - 5.5
Hasler - 3.5
Kappelhof - 4
Marcelo - 4
Campos - 4.5
Schweinsteiger - 5.5
McCarty - 5
Mihailovic - 5
Frankowski - 5.5
Sapong - 5.5
Edwards - 6
Herbers - 6