Seattle Sounders FC is an American professional soccer club based in Seattle, Washington that competes in Major League Soccer (MLS). Sounders FC was established on November 13 2007 as an MLS expansion team, making it the 15th team in the league. Fans chose the Sounders name through an online poll in 2008, making the Seattle Sounders FC the third Seattle soccer club to share the moniker.Seattle has sold out every league match, set MLS records for average attendance, led the league in season ticket sales, and qualified for the MLS Cup playoffs in each of its first four seasons. In 2009, Sounders FC became the second expansion club in MLS history to win the U.S. Open Cup, and in 2010 became the first ever MLS club to repeat as Open Cup champions. Sounders FC won a third consecutive Open Cup in 2011, defeating the Chicago Fire 2–0.