 The Sounders began the 2013 season with the knockout round of the 2012–13 Champions League, facing Mexican club Tigres UANL in the quarterfinals.After losing 1–0 in the away leg and conceding an away goal in the return leg, the Sounders scored three unanswered goals in the second half to win 3–1 and advance to the semifinals.With the win, the Sounders became the first MLS team to eliminate a Mexican team in the knockout stage of CONCACAF Champions League.