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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| O'Connell, Bobby | SP | Buffalo Bisons | 37 | 12/25/2011 | Colorado Springs | USA | Right | Right | 6' 0" | 200 lbs | - |
| O'Connor, Jared | 3B | Free Agent | 26 | 07/23/2022 | Toledo | USA | Switch | Right | 6' 0" | 190 lbs | - |
| O'Hare, Adam | LF | Free Agent | 29 | 01/11/2019 | Fairview Park | USA | Right | Right | 6' 0" | 195 lbs | - |
| Obawole, Torquato | 2B | New Orleans Zephyrs | 25 | 02/01/2023 | Quinhamel | GNB | Right | Right | 6' 1" | 200 lbs | - |
| Odom, Danny | C | Round Rock Express | 36 | 10/27/2012 | Elkhart | USA | Right | Right | 6' 2" | 205 lbs | - |
| Ogg, Sam | 1B | Sacramento River Cats | 27 | 01/13/2021 | Berwyn | USA | Left | Left | 6' 2" | 200 lbs | - |
| Ogilvie, Jamie | 3B | Buffalo Bisons | 37 | 01/01/2011 | New York | USA | Right | Right | 6' 1" | 195 lbs | - |
| Okuhara, Sumiki | RF | Free Agent | 35 | 02/18/2013 | Atsugi | JPN | Left | Left | 6' 1" | 195 lbs | - |
| Olheiser, Chris | C | Tacoma Rainiers | 26 | 12/27/2022 | Shelby | USA | Right | Right | 6' 0" | 200 lbs | - |
| Olivo, Frank | LF | Pawtucket Red Sox | 23 | 01/10/2025 | Murrells Inlet | USA | Left | Right | 6' 0" | 190 lbs | - |
| Omoto, Hideharu | SP | Free Agent | 28 | 10/30/2020 | Itako | JPN | Left | Left | 5' 8" | 180 lbs | - |
| Ono, Shigeru | LF | Free Agent | 25 | 04/22/2023 | Okinawa | JPN | Left | Left | 5' 11" | 195 lbs | - |
| Orphan, Matthew | SP | Omaha Storm Chasers | 24 | 02/13/2024 | Hillsborough | USA | Right | Right | 6' 2" | 200 lbs | - |
| Ortega, Darrell | RF | Oklahoma City Dodgers | 28 | 06/08/2020 | Weymouth | USA | Left | Left | 6' 3" | 205 lbs | $675,000 |
| Ostlund, Bill | RF | Free Agent | 30 | 08/17/2018 | Los Angeles | USA | Left | Left | 6' 3" | 200 lbs | - |
