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.