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Where MLB scouts, college coaches, and top high school prospects meet.
| NAME | DIVISION | CITY | STATE |
|---|---|---|---|
 UCBA Barons |
15U | Lehi | UT |
 Undefeated Academy |
18U | Long Beach | CA |
| Undefeated Academy 2025 |
17U | Long Beach | CA |
| United 2025 |
16U | Edmond | OK |
| United Baseball Baker 14U - Red |
14U | McKinney | TX |
 United Baseball Club |
College | McKinney | TX |
| United Braves |
College | McKinney | TX |
 United Collegiate |
College | mckinney | TX |
| United Nine |
College | McKinney | TX |
 University City Legion (City Boyz) 2027 |
15U/16U | University City | CA |
 Unknown Baseball |
15U/16U | Lubbock | TX |
| Up Top Prospects |
16/17/18 | Houston | TX |
| Up Top Prospects |
18U | Baytown | TX |
| Up Top Prospects 16u Black |
18U | Houston | TX |
| Up Top Prospects 17u |
17U | Baytown | TX |
 Upper Deck Expos |
18U | Billings | MT |
 Uptop Prospects-Alvarado |
17/18 NATIONAL | Houston | TX |
| US Elite/Texas/GST 16U |
15U/16U | Cibolo | TX |
| US Nationals |
15U | Springfield | MO |
| US Nationals 15U Blue |
15U | Winnebago | MO |