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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| O'Connolly, Snicker | SP | Free Agent | 27 | 07/30/2031 | Santa Maria | USA | Right | Right | 6' 2" | 200 lbs | - |
| O'Fallon, Jon | 1B | Free Agent | 32 | 01/01/2027 | Topeka | USA | Right | Right | 6' 2" | 200 lbs | - |
| O'Hanly, Mike | LF | Free Agent | 35 | 03/22/2023 | East Lansing | USA | Switch | Right | 6' 6" | 200 lbs | - |
| O'Leary, Pablo | RP | San Francisco Doves | 26 | 07/21/2032 | Scottsdale | USA | Right | Left | 5' 10" | 185 lbs | - |
| O'Quinn, Jim | 2B | Indianapolis Downforce | 23 | 04/12/2035 | Haifa | ISR | Right | Right | 6' 0" | 185 lbs | - |
| Offredi, Dave | 1B | Milwaukee Choppers | 24 | 04/07/2034 | Montreal | CAN | Right | Right | 6' 1" | 200 lbs | - |
| Oike, Kichibei | 1B | Salt Lake City Alpines | 24 | 05/05/2034 | Kanazawa | JPN | Switch | Right | 6' 2" | 200 lbs | - |
| Oliva, Luis | C | Free Agent | 27 | 05/02/2031 | Hershey | USA | Right | Right | 6' 5" | 200 lbs | - |
| Olivares, Marcus | RP | Duluth Freeze | 29 | 08/11/2029 | Memphis | USA | Right | Right | 6' 6" | 200 lbs | - |
| Olivier, Sébastien | RP | Mars Martians | 24 | 05/05/2034 | Grostenquin | FRA | Right | Right | 5' 10" | 175 lbs | - |
| Ono, Shimpei | SP | Free Agent | 29 | 03/05/2029 | Utashinai | JPN | Right | Right | 6' 0" | 200 lbs | - |
| Ordóñez, José | LF | Death Valley Scorpions | 20 | 04/13/2038 | San Juan | PUR | Right | Right | 6' 3" | 170 lbs | - |
| Ordóñez, Pedro | SP | Free Agent | 34 | 05/13/2024 | Progreso | PAN | Right | Right | 6' 4" | 200 lbs | - |
| Orr, Matthew | RP | Mars Martians | 21 | 03/30/2037 | River Vale | USA | Left | Left | 6' 6" | 195 lbs | - |
| Ortega, José | RP | Mars Martians | 23 | 12/04/2035 | Fairport | USA | Left | Right | 6' 5" | 200 lbs | - |
| Ortega, Mariano | SP | Orlando Oranges | 26 | 09/11/2032 | Ft. Lee | USA | Right | Right | 6' 9" | 205 lbs | - |
| Ortíz, Gilberto | LF | Quincy Firedancers | 25 | 02/01/2034 | Fayetteville | USA | Switch | Right | 6' 1" | 195 lbs | - |
| Ottaway, Bradley | SP | Indianapolis Downforce | 33 | 11/17/2025 | Melbourne | AUS | Right | Right | 6' 4" | 200 lbs | - |
| Ouyang, Cheng-ji | C | Indianapolis Downforce | 33 | 08/16/2025 | Chushan | TPE | Right | Right | 6' 1" | 200 lbs | - |
