The 2020 Lamar Hunt U.S. Open Cup tournament proper featured teams from all five tiers of the men's American soccer pyramid. Qualification for the 2020 tournament included local qualifying matches contested by 88 teams, with a majority being amateur, and took place in late 2019 from September to November. One team also qualified by winning the 2019 National Amateur Cup, and other clubs playing in national leagues that are not fully professional qualified based on their results in 2019 league play.