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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| O, Chang-yong | C | East Rutherford HS Cavaliers | 18 | 08/18/2021 | Seoul | KOR | Right | Right | 6' 2" | 195 lbs | - |
| O'Brennan, Nick | RP | Oswego HS Lynx | 17 | 08/21/2022 | Plano | USA | Right | Right | 5' 11" | 160 lbs | - |
| O'Brien, Chris | 2B | Brophy Prep Broncos | 18 | 03/03/2022 | Queens | USA | Right | Right | 6' 3" | 175 lbs | - |
| O'Brien, Clarence | CL | Seton Hall Prep Pirates | 16 | 12/28/2023 | East Orange | USA | Right | Left | 6' 4" | 185 lbs | - |
| O'Brien, Ken | RF | Billings West HS Lookouts | 17 | 06/26/2022 | Sachse | USA | Right | Right | 6' 2" | 190 lbs | - |
| O'Dell, Jonathan | SP | Castle HS Lords | 17 | 01/30/2023 | Tulsa | USA | Right | Right | 5' 10" | 160 lbs | - |
| O'Hanraghan, Johnny | RP | Carrollton HS Brawlers | 16 | 06/18/2023 | Atlanta | USA | Left | Right | 6' 3" | 180 lbs | - |
| O'Melaghlin, Derrick | SP | Klein-Collins HS Hellcats | 15 | 06/18/2024 | Houston | USA | Right | Right | 6' 0" | 165 lbs | - |
| Ocampo, José | SP | Klein-Collins HS Hellcats | 18 | 12/31/2021 | North Bergen | USA | Left | Left | 6' 2" | 180 lbs | - |
| Ochoa, Eddie | RP | Central HS Wildcats | 16 | 05/23/2023 | Nicollet | USA | Left | Left | 6' 3" | 170 lbs | - |
| Oliveira, Mike | RF | Bishop Moore HS Hornets | 16 | 12/18/2023 | Wekiva Springs | USA | Left | Left | 6' 2" | 180 lbs | - |
| Oliver, Dave | RP | James River HS Rapids | 16 | 12/02/2023 | Cornelius | USA | Right | Right | 6' 1" | 170 lbs | - |
| Oliver, Porter | SP | Wilson Classical HS Bruins | 18 | 07/02/2021 | Gresham | USA | Switch | Right | 5' 11" | 160 lbs | - |
| Olsen, Tim | RP | Mankato West HS Reds | 17 | 01/23/2023 | West Hartford | USA | Right | Right | 6' 9" | 200 lbs | - |
| Olson, Brian | 1B | South Caldwell HS Spartans | 17 | 02/17/2023 | Greensboro | USA | Left | Left | 6' 1" | 190 lbs | - |
| Ordóñez, David | RP | Sprague HS Torchbearers | 15 | 08/19/2024 | Hillsboro | USA | Left | Right | 6' 2" | 175 lbs | - |
| Ordóñez, Gabriel | RP | Jesuit HS Corsairs | 19 | 05/14/2021 | Rogers | USA | Left | Left | 6' 3" | 185 lbs | - |
| Origel, Paul | RP | Snow Canyon HS Yeti | 16 | 02/06/2024 | Hurricane | USA | Right | Right | 6' 2" | 165 lbs | - |
| Orozco, Pedro | RP | Central HS Wildcats | 17 | 02/26/2023 | Morrilton | USA | Right | Right | 6' 4" | 185 lbs | - |
| Ortega, Esteban | SP | Chatfield HS Mustangs | 16 | 12/18/2023 | Welby | USA | Right | Right | 6' 2" | 175 lbs | - |
| Ortega, Luis | RF | Billings West HS Lookouts | 18 | 09/03/2021 | Thousand Oaks | USA | Left | Right | 6' 3" | 180 lbs | - |
| Ortíz, Jerry | SP | Oswego HS Lynx | 17 | 07/10/2022 | Junction City | USA | Right | Right | 6' 2" | 175 lbs | - |
| Ortíz, Jesús | RP | Castle HS Lords | 16 | 08/01/2023 | Clarksville | USA | Right | Right | 6' 1" | 180 lbs | - |
| Ortíz, Juan | C | Palm Beach Gardens HS Gators | 17 | 02/01/2023 | Miami | USA | Right | Right | 6' 3" | 200 lbs | - |
| Ortíz, Manuel | LF | Winter Springs HS Bears | 16 | 04/16/2024 | Port Orange | USA | Switch | Right | 6' 1" | 170 lbs | - |
| Ortíz, Pablo | LF | Brophy Prep Broncos | 17 | 06/16/2022 | Caguas | PUR | Left | Left | 6' 2" | 175 lbs | - |
| Osborne, Kerry | RP | Sarasota HS Sailors | 16 | 04/07/2024 | Treasure Island | USA | Left | Left | 6' 4" | 185 lbs | - |
| Osorio, Tyrone | RP | Chatsworth HS Chancellors | 17 | 01/11/2023 | Brooklyn | USA | Right | Right | 5' 11" | 160 lbs | - |
| Owen, Barry | RP | Billings West HS Lookouts | 16 | 11/27/2023 | Laurel | USA | Right | Left | 6' 11" | 210 lbs | - |
| Owens, Walt | 2B | Union City HS Hillers | 16 | 11/19/2023 | Brooklyn | USA | Right | Right | 6' 3" | 165 lbs | - |
