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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| O'Dell, Stuart | SP | New Haven Ravens | 23 | 08/13/2029 | Crestview | USA | Right | Right | 6' 5" | 195 lbs | - |
| O'Dowd, Caleb | 2B | Free Agent | 26 | 09/30/2025 | Middletown | USA | Right | Right | 5' 9" | 180 lbs | - |
| O'Nell, Bentley | LF | Frisco RoughRiders | 26 | 05/08/2026 | Evansville | USA | Left | Right | 6' 1" | 190 lbs | - |
| Obermuller, Brent | 2B | Free Agent | 27 | 03/13/2025 | Orange | USA | Right | Right | 6' 2" | 200 lbs | - |
| Offer, Edgar | RP | Lincoln Bighorns | 27 | 02/01/2025 | Sun Valley | USA | Left | Right | 6' 3" | 200 lbs | - |
| Ohearn, Samuel | SP | Shreveport Engineers | 26 | 04/18/2026 | Providence | USA | Right | Right | 5' 10" | 175 lbs | - |
| Ojeda, Cole | DH | Providence Crabs | 27 | 04/03/2025 | Jefferson | USA | Right | Right | 6' 4" | 200 lbs | - |
| Olds, Declan | 3B | Northwest Arkansas Naturals | 24 | 02/13/2028 | Middletown | USA | Right | Right | 6' 1" | 190 lbs | - |
| Oliver, Ryland | RF | Montgomery Biscuits | 26 | 12/18/2025 | South Venice | USA | Left | Left | 6' 3" | 205 lbs | $500,000 |
| Olmos, Marc | RP | Free Agent | 26 | 11/08/2025 | Carolina | PUR | Right | Right | 6' 2" | 205 lbs | - |
| Olsen, Christian | RP | Free Agent | 26 | 03/09/2026 | San Diego | USA | Left | Left | 6' 4" | 185 lbs | - |
| Olson, Luca | C | Somerset Patriots | 26 | 04/04/2026 | West Compton | USA | Left | Right | 6' 1" | 200 lbs | - |
| Olvera, Reuben | RP | Pensacola Blue Wahoos | 26 | 06/01/2026 | Los Dos Caminos | VEN | Right | Right | 6' 2" | 200 lbs | $500,000 |
| Ondracek, Len | SP | San Antonio Missions | 22 | 12/13/2029 | Elizabeth | USA | Right | Right | 6' 0" | 180 lbs | - |
| Onley, Darrel | 3B | Free Agent | 27 | 02/08/2025 | Albert Lea | USA | Right | Right | 6' 0" | 200 lbs | - |
| Orea, Ricardo | C | Free Agent | 25 | 11/13/2026 | San Rafael del Yuma | DOM | Right | Right | 5' 9" | 185 lbs | - |
| Orellana, Berny | 1B | Akron RubberDucks | 27 | 07/27/2025 | Mesa | USA | Right | Right | 6' 0" | 200 lbs | - |
| Organek, Devin | RP | Erie SeaWolves | 26 | 12/08/2025 | Gilbert | USA | Left | Left | 5' 11" | 200 lbs | - |
| Oropeza, Jesús | LF | Free Agent | 25 | 02/14/2027 | El Vigía | VEN | Right | Right | 6' 6" | 200 lbs | - |
| Orosco, Natal | SP | Free Agent | 27 | 11/22/2024 | Santo Domingo | DOM | Right | Right | 6' 5" | 200 lbs | - |
| Ortiz, German | 3B | Lancaster Barnstormers | 27 | 07/11/2025 | La Cabima | PAN | Right | Right | 6' 2" | 200 lbs | - |
| Ortiz, J.C. | CF | Mississippi Braves | 26 | 02/02/2026 | New York | USA | Right | Right | 6' 2" | 200 lbs | - |
| Ortiz, Ruy | CF | Yonkers Dark Knights | 27 | 02/19/2025 | Humacao | PUR | Right | Right | 6' 1" | 200 lbs | - |
| Ortiz, Sebastian | CF | Biloxi Shuckers | 27 | 05/25/2025 | Goaigoaza | VEN | Switch | Right | 6' 4" | 200 lbs | - |
| Owen, Jonah | CL | Alexandria Aces | 27 | 06/05/2025 | Corcoran | USA | Right | Right | 6' 7" | 210 lbs | - |
