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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| O'Brien, Maurice | RF | Kingston HS Trail Blazers | 15 | 07/18/2026 | Kingston | JAM | Left | Left | 5' 11" | 175 lbs | - |
| O'Dowd, Ben | RP | Toledo HS Zips | 18 | 01/10/2024 | Parma | USA | Right | Right | 6' 3" | 170 lbs | - |
| O'Mahony, Matt | RP | New York HS Spikes | 16 | 08/01/2025 | Alpine | USA | Left | Left | 6' 0" | 160 lbs | - |
| Obregon, Armando | RF | Puebla HS Peacocks | 15 | 05/04/2027 | Mexico City | MEX | Switch | Right | 6' 3" | 185 lbs | - |
| Ochoa, Antonio | RP | San Juan HS River Kings | 16 | 07/15/2025 | San Juan | PUR | Right | Right | 6' 2" | 175 lbs | - |
| Ojeda, Manuel | 1B | Cuernavaca HS Mallards | 18 | 07/23/2023 | Mexico City | MEX | Right | Right | 6' 5" | 195 lbs | - |
| Olivares, Miguel | SP | St. Louis HS Seahawks | 19 | 04/16/2023 | Lebanon | USA | Right | Right | 6' 3" | 185 lbs | - |
| Olivas, Melvin | SP | Querétaro HS Buffaloes | 19 | 03/29/2023 | Salamanca | MEX | Right | Right | 6' 7" | 205 lbs | - |
| Oliver, David | 2B | Kansas City HS Victory | 14 | 11/09/2027 | Kansas City | USA | Right | Right | 6' 1" | 170 lbs | - |
| Oquendo, Frank | RF | Querétaro HS Buffaloes | 16 | 08/14/2025 | León | MEX | Left | Left | 6' 8" | 200 lbs | - |
| Ornelas, Alberto | 1B | Jacksonville HS Tomahawks | 18 | 11/06/2023 | Middleburg | USA | Right | Right | 6' 2" | 200 lbs | - |
| Ortega, Jose | RP | Puebla HS Peacocks | 17 | 02/11/2025 | Emiliano Zapata | MEX | Left | Right | 6' 1" | 160 lbs | - |
| Ortega, Jose | 1B | Matamoros HS Foresters | 17 | 02/19/2025 | Reynosa | MEX | Left | Right | 6' 1" | 170 lbs | - |
| Ortega, Vicente | C | Ecatepec HS Seawolves | 18 | 10/14/2023 | Mexico City | MEX | Right | Right | 6' 2" | 205 lbs | - |
| Ortiz, Manuel | LF | San Juan HS River Kings | 16 | 11/30/2025 | San Juan | PUR | Switch | Right | 6' 0" | 190 lbs | - |
| Orton, Corbin | 3B | St. Louis HS Seahawks | 15 | 03/24/2027 | Madison | USA | Right | Right | 6' 0" | 180 lbs | - |
| Osorio, Danny | SP | Ixtapaluca HS Irish | 16 | 12/23/2025 | Teyahualco | MEX | Right | Right | 6' 6" | 190 lbs | - |
| Osthoff, Steve | RF | Jacksonville HS Tomahawks | 16 | 11/04/2025 | Palm Valley | USA | Left | Left | 6' 1" | 190 lbs | - |
| Owen, Jason | RP | Kingston HS Trail Blazers | 16 | 06/19/2025 | Spanish Town | JAM | Right | Right | 6' 9" | 200 lbs | - |
| Owen, Matt | RF | Kingston HS Trail Blazers | 14 | 09/19/2027 | Chicago | USA | Left | Left | 6' 5" | 200 lbs | - |
| Owens, Greg | 1B | Colorado Springs HS Arrows | 16 | 09/23/2025 | Lakewood | USA | Left | Left | 6' 2" | 200 lbs | - |
| Oyola, Mario | DH | Torreón HS Walruses | 17 | 03/17/2025 | Guadalupe Victoria | MEX | Switch | Right | 6' 3" | 180 lbs | - |
| Ozuna, Carlos | RP | Veracruz HS Impact | 15 | 06/01/2027 | Potrero Nuevo | MEX | Right | Right | 6' 5" | 180 lbs | - |
