The 2011 Lamar Hunt U.S. Open Cup was the 98th edition of the USSF's annual national soccer championship, running from June through early October. Seattle Sounders FC, who entered the competition as the two-time defending champions, successfully defended their title again. They became the third team in U.S. Open Cup history to win three straight U.S. Open Cups (the others being Stix, Baer and Fuller/St. Louis Central Breweries from 1933 to 1935 and Greek American AA from 1967 to 1969 — this excludes the run of Fall River F.C. in 1930 and 1931, as the team that won in 1932, New Bedford Whalers, was the result of mergers of teams that included Fall River). As winner of the Open Cup, the Sounders earned a place in the 2012–13 CONCACAF Champions LeagueGroup stage (the preliminary round will be eliminated from the CONCACAF Champions League starting from 2012–13). The farthest advancing USL Pro team was the Richmond Kickers.
On February 17, 2011, the USSF announced that no NASL teams will be participating in the competition since the league did not obtain provisional sanctioning in time.[3]