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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| O'Connell, Bobby | SP | Buffalo Bisons | 36 | 12/25/2011 | Colorado Springs | USA | Right | Right | 6' 0" | 195 lbs | - |
| O'Hare, Adam | LF | Iowa Cubs | 28 | 01/11/2019 | Fairview Park | USA | Right | Right | 6' 0" | 190 lbs | $675,000 |
| O'Toole, Barrfhionn | RF | Salt Lake Bees | 27 | 03/16/2020 | Roscrea | IRL | Left | Left | 6' 3" | 200 lbs | - |
| Oba, Tetsuya | 3B | Columbus Clippers | 32 | 08/30/2015 | Yamagata | JPN | Left | Right | 6' 0" | 190 lbs | - |
| Obawole, Torquato | 2B | New Orleans Zephyrs | 24 | 02/01/2023 | Quinhamel | GNB | Right | Right | 6' 1" | 195 lbs | - |
| Ocana, Mario | SS | Durham Bulls | 24 | 11/13/2023 | Tucupita | VEN | Left | Right | 6' 2" | 195 lbs | - |
| Ochoa, Willie | C | Toledo Mud Hens | 25 | 06/12/2022 | San Diego | USA | Right | Right | 6' 5" | 200 lbs | - |
| Olivo, Frank | LF | Pawtucket Red Sox | 22 | 01/10/2025 | Murrells Inlet | USA | Left | Right | 6' 0" | 185 lbs | - |
| Olson, J.P. | CF | Free Agent | 25 | 10/01/2022 | Weslaco | USA | Left | Left | 6' 4" | 200 lbs | - |
| Omoto, Hideharu | RP | Indianapolis Indians | 27 | 10/30/2020 | Itako | JPN | Left | Left | 5' 8" | 180 lbs | - |
| Omura, Katsumi | SP | Free Agent | 33 | 10/24/2014 | Ago | JPN | Switch | Left | 6' 1" | 185 lbs | - |
| Ortega, Cesar | 3B | Free Agent | 28 | 08/18/2019 | Cotuí | DOM | Right | Right | 6' 0" | 180 lbs | - |
| Ortega, Darrell | RF | Oklahoma City Dodgers | 27 | 06/08/2020 | Weymouth | USA | Left | Left | 6' 3" | 205 lbs | $675,000 |
| Ortiz, Jose | RP | Syracuse Chiefs | 18 | 07/01/2029 | Masaya | NCA | Right | Right | 6' 0" | 180 lbs | - |
| Ostlund, Bill | RF | Free Agent | 29 | 08/17/2018 | Los Angeles | USA | Left | Left | 6' 3" | 200 lbs | - |
