Seattle Sounders FC entered Major League Soccer in 2009, facing the challenges that come with building a competitive roster from scratch. Expansion teams in MLS face unique challenges including roster construction through expansion drafts, player acquisitions, and building team chemistry in a compressed timeline.
First seasons in MLS set the foundation for a club's identity and culture. The early results, fan engagement, and organizational structure established during a team's inaugural campaign often shape the franchise's trajectory for years to come. Seattle Sounders's first season helped establish the club's presence in Seattle and laid the groundwork for future success.