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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| O'Connell, Ian | SP | Ottawa Oddballs | 32 | 04/24/2020 | Brooklyn | USA | Right | Left | 6' 6" | 200 lbs | - |
| O'Neal, Gino | SP | Durham Bulls | 28 | 10/09/2023 | Arlington | USA | Right | Right | 5' 10" | 180 lbs | - |
| O'Neal, Lucas | SP | Free Agent | 33 | 09/01/2019 | Antioch | USA | Left | Left | 6' 4" | 205 lbs | - |
| O'Rourke, Billy | SP | Durham Bulls | 29 | 11/11/2022 | Los Angeles | USA | Left | Left | 6' 0" | 195 lbs | - |
| Obodo, Michael | LF | Gwinnett Stripers | 33 | 10/15/2018 | Biddeford | USA | Left | Left | 6' 4" | 200 lbs | - |
| Oden, D.J. | C | Sacramento River Cats | 29 | 10/27/2022 | Lancaster | USA | Right | Right | 6' 1" | 200 lbs | $500,000 |
| Oden, Richard | CF | Durham Bulls | 28 | 08/05/2024 | Washington | USA | Right | Right | 6' 2" | 200 lbs | - |
| Ogaz, Finney | C | Free Agent | 33 | 06/25/2019 | Boca Raton | USA | Left | Right | 6' 0" | 200 lbs | - |
| Ogles, Declan | SP | Columbus Clippers | 30 | 09/13/2022 | Brooklyn | USA | Right | Right | 6' 6" | 205 lbs | - |
| Ojeda, Leo | RF | Free Agent | 28 | 09/17/2023 | Levittown | PUR | Switch | Right | 6' 1" | 200 lbs | - |
| Olivarez, Alvaro | RF | Free Agent | 27 | 09/03/2025 | Ft. Lauderdale | USA | Left | Left | 6' 7" | 200 lbs | - |
| Olivas, Pastor | SP | Birmingham Barons | 31 | 03/21/2021 | Santo Domingo | DOM | Switch | Right | 5' 9" | 185 lbs | - |
| Olvera, Aristeo | RP | Gwinnett Stripers | 28 | 07/19/2024 | Deerfield | USA | Right | Right | 6' 2" | 205 lbs | - |
| Oquendo, Jack | SS | Free Agent | 29 | 05/25/2023 | Meriden | USA | Right | Right | 5' 11" | 185 lbs | - |
| Orta, Isaiah | 3B | Free Agent | 28 | 06/18/2024 | Savannah | USA | Switch | Right | 6' 0" | 195 lbs | - |
| Ortega, Huey | RF | Free Agent | 28 | 05/27/2024 | Collinsville | USA | Switch | Right | 6' 1" | 195 lbs | - |
| Ortega, Orlando | 2B | Free Agent | 29 | 02/26/2023 | Santo Domingo | DOM | Right | Right | 6' 1" | 200 lbs | - |
| Ortiz, Rodrigo | LF | Gwinnett Stripers | 28 | 12/24/2023 | Petare | VEN | Left | Left | 6' 2" | 200 lbs | - |
| Osorio, Carlos | SP | Albuquerque Isotopes | 25 | 12/19/2026 | Santo Domingo | DOM | Right | Right | 6' 4" | 200 lbs | - |
| Ospina, Francisco | SP | Louisville Bats | 27 | 07/24/2025 | Enon | USA | Left | Right | 6' 4" | 200 lbs | - |
| Ou, Ryan | SS | New Orleans Baby Cakes | 26 | 09/11/2026 | Olney | USA | Right | Right | 6' 2" | 200 lbs | $500,000 |
| Owen, Calvin | SP | El Paso Chihuahuas | 32 | 03/14/2020 | Wooster | USA | Right | Right | 6' 2" | 205 lbs | $1,000,000 |
| Oxford, Wesley | RP | Free Agent | 29 | 10/15/2022 | Upland | USA | Left | Left | 6' 4" | 200 lbs | - |
