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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| O, Sang-hoon | SP | Free Agent | 38 | 10/03/2013 | Busan | KOR | Right | Right | 6' 1" | 210 lbs | - |
| O'Bryan, Ryan | SS | Redwood City Redwoods | 25 | 09/30/2026 | Garrettsville | USA | Switch | Right | 5' 9" | 185 lbs | - |
| O'Donnell, Brent | C | Vancouver Vipers | 26 | 12/02/2025 | Torrance | USA | Right | Right | 6' 3" | 200 lbs | - |
| O'Hamil, Nathan | C | Houston Hammertime | 25 | 09/26/2026 | Philadelphia | USA | Right | Right | 6' 6" | 200 lbs | - |
| O'Leary, Rory | LF | Oklahoma City 89ers | 29 | 02/24/2022 | Beverly Hills | USA | Right | Right | 6' 5" | 200 lbs | - |
| O'Neil, John | 3B | Louisville Bats | 27 | 11/16/2024 | Columbia | USA | Right | Right | 6' 1" | 200 lbs | - |
| O'Riordan, Joe | RP | Free Agent | 28 | 08/22/2023 | West Palm Beach | USA | Right | Right | 6' 1" | 190 lbs | - |
| Obrenovic, Dan | SP | Waco Blue Cats | 28 | 07/27/2023 | Fairton | USA | Left | Right | 6' 4" | 205 lbs | - |
| Ogawa, Moromao | SP | Santo Domingo Dragons | 30 | 09/01/2021 | Hirokawa | JPN | Right | Right | 6' 1" | 190 lbs | - |
| Ohayashi, Yoshihide | 2B | Waco Blue Cats | 22 | 06/11/2029 | Hachioji | JPN | Right | Right | 6' 2" | 185 lbs | - |
| Olivares, Gustavo | 3B | New England Whalers | 35 | 12/20/2016 | Puerto Plata | DOM | Right | Right | 6' 1" | 200 lbs | - |
| Olivares, Pedro | SS | Spokane Trappers | 26 | 10/22/2025 | La Vega | DOM | Right | Right | 6' 4" | 200 lbs | - |
| Oliver, Bill | C | Cornwall Royals | 23 | 05/31/2028 | Cottonwood Heights | USA | Right | Right | 6' 1" | 200 lbs | - |
| Ontario, Francisco | RP | Free Agent | 33 | 12/29/2018 | El Limón | VEN | Right | Right | 6' 2" | 200 lbs | - |
| Ordóñez, Domingo | C | Spokane Trappers | 31 | 02/06/2020 | San Pedro de Macorís | DOM | Right | Right | 6' 1" | 200 lbs | $400,000 |
| Orozco, Eduardo | 2B | Free Agent | 33 | 07/23/2018 | Cornwall | USA | Left | Right | 6' 0" | 185 lbs | - |
| Ortega, Emílio | CF | Free Agent | 31 | 09/07/2020 | Santo Domingo | DOM | Left | Left | 6' 2" | 200 lbs | - |
| Ortíz, José | SP | Free Agent | 33 | 08/16/2018 | Sandy Springs | USA | Left | Right | 5' 11" | 195 lbs | - |
| Ortíz, Pedro | CF | Galveston Tides | 27 | 09/01/2024 | Valle de la Pascua | VEN | Right | Right | 6' 0" | 195 lbs | $400,000 |
| Ortíz, Ricardo | 2B | Redwood City Redwoods | 22 | 01/19/2029 | Santo Domingo | DOM | Right | Right | 5' 11" | 165 lbs | - |
| Ortíz, Tomás | RF | Allentown Hillbillies | 27 | 07/20/2024 | Oxford | USA | Left | Left | 6' 6" | 205 lbs | - |
| Otake, Takanobu | 3B | Cornwall Royals | 30 | 07/05/2021 | Yokohama | JPN | Right | Right | 6' 4" | 200 lbs | - |
| Overstreet, Neal | SS | Louisville Bats | 26 | 04/04/2025 | Belmont | USA | Right | Right | 6' 4" | 200 lbs | $400,000 |
