2018 Lamar Hunt U.S. Open Cup Geographic Grouping of Teams Prior to Fourth Round Draw Northeast Louisville City FC (USL) New England Revolution (MLS) New York City FC (MLS) New York Red Bulls (MLS) Mid-Atlantic D.C. United (MLS) North Carolina FC (USL) Philadelphia Union (MLS) Richmond Kickers (USL) Southeast Atlanta United FC (MLS) Charleston Battery (USL) Miami United FC (NPSL) Orlando City SC (MLS) North Central Chicago Fire Soccer Club (MLS) Columbus Crew SC (MLS) FC Cincinnati (USL) Minnesota United FC (MLS) Central Colorado Rapids (MLS) Nashville SC (USL) Real Salt Lake (MLS) Sporting Kansas City (MLS) Texas FC Dallas (MLS) Houston Dynamo (MLS) NTX Rayados (Texas) San Antonio FC (USL) Southern California FC Golden State Force (PDL) Fresno FC (USL) LA Galaxy (MLS) Los Angeles FC (MLS) Northwest Portland Timbers (MLS) Sacramento Republic FC (USL) San Jose Earthquakes (MLS) Seattle Sounders FC (MLS)