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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| O'Brien, Keith | RP | Winston-Salem Dash | 21 | 11/16/2028 | Rowlett | USA | Left | Left | 6' 2" | 195 lbs | - |
| O'Connor, Troy | SP | Winston-Salem Dash | 21 | 01/13/2028 | Sydney | AUS | Right | Right | 6' 2" | 180 lbs | - |
| O'Donnell, Jonathan | RP | Free Agent | 29 | 02/03/2020 | Farwell | USA | Left | Left | 6' 5" | 200 lbs | - |
| O'Neal, Josh | RP | Charlotte Stone Crabs | 23 | 02/14/2026 | St. Johns | USA | Right | Right | 6' 2" | 195 lbs | - |
| Oake, Ed | 3B | Lake Elsinore Storm | 25 | 06/19/2024 | Laval | CAN | Right | Right | 6' 2" | 200 lbs | - |
| Oakes, Mike | RP | Dunedin Blue Jays | 24 | 07/08/2025 | Brooklyn | USA | Left | Left | 6' 4" | 200 lbs | - |
| Ocana, Mario | SS | Charlotte Stone Crabs | 26 | 11/13/2023 | Tucupita | VEN | Left | Right | 6' 2" | 200 lbs | - |
| Ogg, Sam | 1B | Richmond Flying Squirrels | 28 | 01/13/2021 | Berwyn | USA | Left | Left | 6' 2" | 200 lbs | - |
| Oki, Yutaka | CF | Visalia Rawhide | 27 | 06/02/2022 | Yokohama | JPN | Right | Right | 6' 1" | 205 lbs | - |
| Olave, Manny | LF | Brevard County Manatees | 21 | 08/16/2028 | Panama | PAN | Right | Right | 6' 0" | 180 lbs | - |
| Olson, Paul | SP | Stockton Ports | 20 | 01/06/2029 | Carrollton | USA | Switch | Right | 6' 2" | 190 lbs | - |
| Olujimi, Iften | SS | Tampa Yankees | 26 | 07/13/2023 | Cape Town | RSA | Right | Right | 6' 1" | 200 lbs | - |
| Olvera, Hector | RF | Fort Myers Miracle | 23 | 04/08/2026 | Santiago de Cuba | CUB | Left | Left | 6' 2" | 180 lbs | - |
| Ono, Shigeru | LF | Carolina Mudcats | 26 | 04/22/2023 | Okinawa | JPN | Left | Left | 5' 11" | 195 lbs | - |
| Ontiveros, Jose | CF | Dunedin Blue Jays | 27 | 08/29/2022 | San Pedro de Macorís | DOM | Right | Right | 6' 2" | 205 lbs | - |
| Ordonez, Juan | CF | Lynchburg Hillcats | 22 | 05/24/2027 | Santo Domingo | DOM | Right | Right | 6' 3" | 195 lbs | - |
| Orengo, Melvin | SP | Myrtle Beach Pelicans | 21 | 08/29/2028 | El Viejo | NCA | Right | Right | 6' 4" | 170 lbs | - |
| Orozco, Armando | SP | Palm Beach Cardinals | 17 | 05/13/2032 | Ibagué | COL | Left | Left | 6' 0" | 170 lbs | - |
| Orozco, Dan | SS | Myrtle Beach Pelicans | 21 | 05/21/2028 | Hot Springs | USA | Right | Right | 5' 11" | 190 lbs | - |
| Ortega, Franklin | 3B | Potomac Nationals | 20 | 05/15/2029 | Havana | CUB | Right | Right | 6' 2" | 195 lbs | - |
| Ortiz, Edgar | 3B | Wilmington Blue Rocks | 22 | 04/06/2027 | Guacara | VEN | Left | Right | 6' 4" | 200 lbs | - |
| Ortiz, Terciero | 1B | Lancaster JetHawks | 21 | 11/24/2028 | Ceres | USA | Switch | Right | 6' 3" | 195 lbs | - |
| Osborne, Jack | SP | Dunedin Blue Jays | 21 | 08/26/2028 | Melbourne | AUS | Right | Left | 6' 8" | 200 lbs | - |
| Osorio, Juan | SP | Modesto Nuts | 19 | 09/22/2030 | Los Angeles | USA | Right | Right | 6' 5" | 200 lbs | - |
| Ott, Butch | SP | Wilmington Blue Rocks | 24 | 05/20/2025 | Suffolk | USA | Left | Left | 6' 4" | 200 lbs | - |
| Oya, Kunimatsu | SS | Winston-Salem Dash | 27 | 02/02/2022 | Iwaki | JPN | Right | Right | 6' 0" | 200 lbs | - |
| Oyler, Adam | SP | Lakeland Flying Tigers | 24 | 03/04/2025 | Santa Rosa | USA | Right | Right | 6' 1" | 195 lbs | - |
| Oyola, Antonio | LF | Bakersfield Blaze | 24 | 07/28/2025 | Mariara | VEN | Right | Right | 6' 3" | 200 lbs | - |
