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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| O'Connor, Benny | 1B | Toledo Mud Hens | 28 | 05/04/2021 | Racine | USA | Right | Right | 6' 6" | 200 lbs | - |
| O'Leary, Bobby | 3B | Louisville Bats | 27 | 10/16/2022 | Clarksville | USA | Switch | Right | 6' 0" | 200 lbs | - |
| Ochoa, Gabe | SS | Louisville Bats | 27 | 12/04/2022 | Puebla | MEX | Right | Right | 6' 1" | 200 lbs | - |
| Ochoa, Wil | LF | Norfolk Tides | 23 | 03/19/2026 | Santo Domingo | DOM | Right | Right | 6' 0" | 185 lbs | - |
| Odom, Danny | C | Round Rock Express | 37 | 10/27/2012 | Elkhart | USA | Right | Right | 6' 2" | 200 lbs | - |
| Ody, Adam | SP | Free Agent | 28 | 04/16/2021 | Raleigh | USA | Left | Left | 6' 5" | 195 lbs | - |
| Olech, Jeff | SP | Gwinnett Braves | 29 | 10/11/2020 | Columbia | USA | Switch | Right | 6' 0" | 170 lbs | - |
| Olheiser, Chris | C | Tacoma Rainiers | 27 | 12/27/2022 | Shelby | USA | Right | Right | 6' 0" | 200 lbs | - |
| Oliynyk, Matviy | 3B | Colorado Springs Sky Sox | 24 | 04/23/2025 | Lutsk | UKR | Right | Right | 6' 8" | 215 lbs | - |
| Olsen, Tim | LF | Free Agent | 29 | 03/28/2020 | Biddeford | USA | Left | Right | 6' 0" | 200 lbs | - |
| Olvera, Tony | CF | Syracuse Chiefs | 19 | 02/02/2030 | Waspan | NCA | Left | Left | 6' 4" | 185 lbs | - |
| Omoto, Hideharu | SP | Buffalo Bisons | 29 | 10/30/2020 | Itako | JPN | Left | Left | 5' 8" | 180 lbs | - |
| Osumi, Yasushi | SP | Colorado Springs Sky Sox | 35 | 04/02/2014 | Saijo | JPN | Left | Right | 6' 4" | 205 lbs | - |
| Ou-yang, Zhi-bin | 2B | Buffalo Bisons | 37 | 12/19/2012 | Kaohsiung | TPE | Right | Right | 6' 1" | 200 lbs | - |
| Overbeek, Jack | SP | Free Agent | 33 | 03/13/2016 | Tytsjerksteradiel | NED | Right | Right | 6' 6" | 200 lbs | - |
