[U.S. OPEN CUP: Preview] Despite a long and rich history the U.S. Open Cup is more renowned for what it earns than what it is. An automatic spot in the ConcacafChampions League, one of four places allotted to U.S. Soccer-registered teams, is at stake Tuesday at Rio Tinto Stadium when Real Salt Lake hosts two-time winner D.C. United to decide the 100thedition of a competition that began in 1913.

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