In the playoffs, the Sounders hosted Sporting Kansas City on October 27 in the single-match knockout round. The team won 1–0, off a headed goal in the 88th minute by Nelson Valdez, ending a personal scoring drought. Seattle advanced to the Conference Semifinals against FC Dallas, winning the home leg 3–0 and losing 2–1 away, for a 4–2 aggregate score. On November 27, the Sounders clinched their first Western Conference championship after a 3–1 aggregate win over the Colorado Rapids, after a 2–1 win at home and a 1–0 win in Colorado that came from a late goal by Morris, who was recovering from the flu.
