2023 US Open Cup Round 3: Record crowd watches St. Louis CITY crush Union Omaha in USOC debut April 28, 2023 by Justin Horneker With more than 100 years of history, and now an Open Cup Third Round attendance record to add to its storied past as 22,423 at CityPark had much to celebrate as St. Louis City SC soared past Union Omaha, 5-1.