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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| O' Neill, Gregório | 2B | Salem-Keizer Volcanoes | 18 | 01/01/2031 | Ciudad Guayana | VEN | Right | Right | 6' 0" | 170 lbs | - |
| O'Connor, Adam | 1B | Moscow Mules | 27 | 11/26/2021 | Sacramento | USA | Right | Right | 6' 3" | 205 lbs | - |
| O'Doherty, Callahan | CF | Salem-Keizer Volcanoes | 18 | 12/02/2030 | Dublin | IRL | Left | Right | 6' 1" | 170 lbs | - |
| O'Flaherty, Caspar | RP | Concord Blue Devils | 21 | 10/08/2027 | Adelaide | AUS | Right | Right | 6' 5" | 200 lbs | - |
| Obando, Julio | C | Great Lakes Loons | 19 | 06/26/2029 | San Pedro de Macorís | DOM | Right | Right | 6' 4" | 215 lbs | - |
| Ockerman, Adrian | SP | Free Agent | 26 | 07/10/2022 | South El Monte | USA | Right | Right | 6' 0" | 200 lbs | - |
| Ogaz, Edgar | RP | Great Lakes Loons | 21 | 08/19/2027 | Valencia | VEN | Switch | Right | 6' 6" | 205 lbs | - |
| Oliva, Juan | SP | Free Agent | 20 | 01/25/2029 | Santo Domingo | DOM | Right | Left | 6' 3" | 180 lbs | - |
| Olivares, Jorge | CF | Moscow Mules | 22 | 09/23/2026 | San Antonio de los Altos | VEN | Right | Right | 6' 0" | 185 lbs | - |
| Orias, Gilberto | SP | Schenectady Grasshoppers | 21 | 01/05/2028 | Santo Domingo | DOM | Right | Left | 6' 4" | 180 lbs | - |
| Orona, Melvin | SP | Free Agent | 21 | 12/19/2027 | Valencia | VEN | Right | Right | 6' 5" | 195 lbs | - |
| Orozco, Tony | C | Free Agent | 24 | 09/17/2024 | Santo Domingo | DOM | Switch | Right | 6' 4" | 210 lbs | - |
| Ortiz, Alberto | RP | Concord Blue Devils | 20 | 08/10/2028 | Santo Domingo | DOM | Right | Right | 6' 4" | 195 lbs | - |
| Ortiz, Alex | RP | Free Agent | 20 | 08/13/2028 | Padre las Casas | DOM | Switch | Right | 6' 4" | 190 lbs | - |
| Ortiz, Frank | RP | Charleston Chews | 23 | 07/31/2025 | Santo Domingo | DOM | Right | Right | 6' 2" | 190 lbs | - |
| Osina, Jon | RP | Salem-Keizer Volcanoes | 26 | 10/05/2022 | Waukegan | USA | Left | Left | 6' 0" | 185 lbs | - |
| Otero, Mario | SP | Concord Blue Devils | 22 | 08/05/2026 | Miami Beach | USA | Switch | Left | 6' 2" | 200 lbs | - |
