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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| O'Connor, Austin | SP | Salem Red Sox | 18 | 11/12/2026 | Anaheim | USA | Right | Right | 6' 4" | 195 lbs | - |
| O'Connor, Benny | 1B | Winston-Salem Dash | 23 | 05/04/2021 | Racine | USA | Right | Right | 6' 6" | 200 lbs | - |
| O'Neal, Josh | C | Bakersfield Blaze | 26 | 06/12/2018 | Peoria | USA | Right | Right | 5' 11" | 200 lbs | - |
| Obawole, Torquato | 2B | Jupiter Hammerheads | 21 | 02/01/2023 | Quinhamel | GNB | Right | Right | 6' 1" | 185 lbs | $625,000 |
| Ochoa, Gabe | SS | Richmond Flying Squirrels | 22 | 12/04/2022 | Puebla | MEX | Right | Right | 6' 1" | 200 lbs | - |
| Olausson, Joel | RP | Bradenton Marauders | 21 | 04/01/2023 | Canton | USA | Right | Right | 6' 1" | 195 lbs | - |
| Oliveri, Evan | C | Winston-Salem Dash | 21 | 10/18/2023 | Kensington Park | USA | Left | Left | 6' 0" | 195 lbs | - |
| Olivo, Jon | SP | Salem Red Sox | 20 | 07/07/2024 | Coyuca | MEX | Right | Right | 6' 7" | 210 lbs | - |
| Olsen, Mike | LF | Lakeland Flying Tigers | 26 | 05/29/2018 | Camden | USA | Right | Right | 6' 1" | 200 lbs | - |
| Omoto, Hideharu | SP | Bradenton Marauders | 24 | 10/30/2020 | Itako | JPN | Left | Left | 5' 8" | 180 lbs | - |
| Orosco, Omar | CL | Carolina Mudcats | 20 | 05/01/2024 | Calexico | USA | Right | Right | 6' 4" | 200 lbs | - |
| Orphan, Matthew | SP | Wilmington Blue Rocks | 20 | 02/13/2024 | Hillsborough | USA | Right | Right | 6' 2" | 190 lbs | - |
| Orr, Justin | RP | Free Agent | 26 | 05/17/2018 | Thomasville | USA | Left | Right | 6' 4" | 200 lbs | - |
| Ortega, Alfonso | RP | Free Agent | 25 | 02/26/2019 | Tuxtla Gutiérrez | MEX | Right | Right | 6' 3" | 200 lbs | - |
| Ortiz, Chris | C | Fort Myers Miracle | 25 | 05/06/2019 | Holguín | CUB | Switch | Right | 6' 2" | 200 lbs | - |
| Ortiz, Ricardo | 3B | Free Agent | 28 | 03/09/2016 | Turmero | VEN | Right | Right | 6' 3" | 195 lbs | - |
| Ortner, Mark | C | Daytona Tortugas | 24 | 05/13/2020 | Montebello | USA | Right | Right | 6' 4" | 200 lbs | - |
| Osborne, Harry | SP | Potomac Nationals | 21 | 10/04/2023 | Trois-Rivières | CAN | Left | Left | 6' 6" | 200 lbs | - |
| Osgood, Mike | RP | Lake Elsinore Storm | 19 | 11/01/2025 | Detroit | USA | Left | Right | 6' 5" | 195 lbs | - |
| Ostrom, Jason | CF | Myrtle Beach Pelicans | 23 | 10/10/2021 | Levittown | USA | Right | Right | 6' 1" | 195 lbs | - |
| Ott, Dan | RP | Modesto Nuts | 21 | 03/02/2023 | Zillah | USA | Switch | Left | 6' 0" | 185 lbs | - |
| Ott, Lee | RP | Stockton Ports | 24 | 06/12/2020 | Los Angeles | USA | Right | Right | 6' 8" | 200 lbs | - |
| Otton, Jared | RP | Free Agent | 30 | 11/16/2014 | Phoenix | USA | Right | Right | 5' 11" | 200 lbs | - |
