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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| O'Brien, William | RP | Free Agent | 30 | 07/08/2022 | Albuquerque | USA | Right | Right | 6' 2" | 215 lbs | - |
| O'Higgins, Justin | 1B | Provoka Pirates | 22 | 11/18/2030 | Portland | USA | Right | Right | 6' 1" | 200 lbs | - |
| O'Neill, Connor | RP | Chicago Beans | 27 | 01/05/2026 | Kinsale | IRL | Right | Right | 6' 0" | 200 lbs | - |
| O'Toole, Dave | SP | Chicago Beans | 24 | 05/26/2028 | Hudson | USA | Switch | Right | 6' 2" | 190 lbs | - |
| Ohayashi, Kosaku | 3B | Pontiac Aztecs | 27 | 08/02/2025 | Tokyo | JPN | Right | Right | 6' 1" | 190 lbs | - |
| Oike, Yasuo | SS | Campustown Commodores | 24 | 03/27/2029 | Kawagoe | JPN | Right | Right | 6' 2" | 190 lbs | - |
| Oliver, Daniel | SP | Pontiac Aztecs | 25 | 07/18/2027 | London | CAN | Right | Right | 6' 6" | 215 lbs | - |
| Ortíz, Dave | 3B | Chicago Deep Dish | 29 | 12/11/2023 | Miami | USA | Right | Right | 5' 10" | 185 lbs | - |
| Ortíz, Jorge | SP | Macon Whoopie | 23 | 12/27/2029 | Santo Domingo | DOM | Right | Right | 6' 2" | 195 lbs | - |
| Ortíz, Júlio | SP | Maumee River Ports | 25 | 03/19/2028 | Panama | PAN | Right | Right | 6' 1" | 195 lbs | - |
| Ortíz, Nelson | CF | Lafeyette Lizards | 26 | 12/28/2026 | Chanute | USA | Right | Right | 6' 4" | 205 lbs | $750,000 |
| Osborne, Greg | RP | Naubinway Mariners | 30 | 09/19/2022 | Scottsboro | USA | Right | Right | 6' 1" | 205 lbs | - |
| Otero, Diego | C | Chicago Beans | 25 | 01/11/2028 | Santiago de Cuba | CUB | Right | Right | 6' 4" | 215 lbs | - |
| Owen, Larry | 3B | Clerya Sandstorms | 24 | 05/24/2028 | Carlisle | USA | Right | Right | 6' 4" | 210 lbs | - |
