Dating back to 1914, the Lamar Hunt U.S. Open Cup is the oldest cup competition in United States soccer and is among the oldest in the world. Open to all affiliated amateur and professional teams in the United States, the annual U.S. Open Cup is an 90-year-old single-elimination tournament.
In a nutshell, the U.S. Open Cup is very similar to domestic cup competitions popular throughout Europe, South America and the rest of the world. Cup competitions, which usually run concurrent with a country’s league season, are open in the early stages to any club that can qualify, giving local amateur teams a chance to compete against the best teams a country has to offer.
For cup schedules and more info please visit here.