The 2013 Lamar Hunt U.S. Open Cup was the 100th edition of the oldest ongoing competition in American soccer.
Qualification began in November 2012 in the fifth tier, although the United States Soccer Federation did not announce the format until March 5, 2013.
[1] The defending champions were Sporting Kansas City, who were knocked out of the competition in the fourth round.
Three teams received $15,000 for being the top finisher from each lower division - Des Moines Menace (USL PDL), Orlando City (USL Pro), & Carolina RailHawks (NASL).
Two play-in matches were conducted between 2 NPSL teams and the entrants for USCS and SS with the winners entering the first round.