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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| O, Soong-yong | SP | Brooklyn Robins | 17 | 07/07/2041 | Chongjin | PRK | Right | Right | 6' 1" | 175 lbs | - |
| O'Connor, Bill | RP | Bikini Krill | 35 | 04/15/2023 | Nacogdoches | USA | Right | Right | 6' 3" | 200 lbs | $3,000,000 |
| O'Donnell, Roy | C | Jacksonville Hurricanes | 21 | 05/10/2037 | Vancouver | CAN | Switch | Right | 6' 3" | 200 lbs | $500,000 |
| O'Gribben, Dean | SP | Free Agent | 32 | 03/10/2026 | Cheadle & Gatley | ENG | Switch | Right | 6' 1" | 200 lbs | - |
| O'Halloran, Michael | LF | Phoenix Talons | 26 | 06/15/2032 | Ormond-By-The-Sea | USA | Left | Left | 5' 10" | 175 lbs | $5,900,000 |
| O'Halloran, Oscar | SP | Omaha Cyclones | 23 | 10/26/2035 | Raleigh | USA | Right | Right | 6' 7" | 200 lbs | $500,000 |
| O'Hara, Hollis | C | Atlantic City Gamblers | 33 | 12/10/2024 | Bridgewater | USA | Left | Left | 6' 6" | 200 lbs | $13,000,000 |
| O'Reilly, Dave | RP | Yellow Springs Nine | 30 | 08/30/2028 | Dallas | USA | Right | Right | 6' 6" | 200 lbs | $500,000 |
| O'Toole, Bill | CF | Boise Spuds | 27 | 02/17/2031 | Vaughan | CAN | Right | Right | 6' 0" | 190 lbs | $600,000 |
| Oanta, Valerian | SP | Charlotte Flyers | 19 | 07/17/2039 | Lipova | ROM | Left | Left | 6' 4" | 190 lbs | - |
| Ober, Tyler | 1B | Atlantic City Gamblers | 32 | 12/17/2025 | Yuma | USA | Left | Right | 6' 0" | 185 lbs | $12,500,000 |
| Obrenovic, Djodja | RP | Free Agent | 31 | 04/11/2027 | Pestera | BUL | Left | Left | 6' 0" | 185 lbs | - |
| Ogun, Hüsnü | RP | Free Agent | 24 | 02/14/2034 | Adana | TUR | Left | Left | 6' 0" | 180 lbs | - |
| Ohayashi, Hideaki | 1B | Portland Lumberjacks | 24 | 11/16/2033 | Kobe | JPN | Right | Right | 6' 4" | 200 lbs | $500,000 |
| Ohayashi, Sorai | C | Brooklyn Robins | 28 | 05/18/2030 | Tokyo | JPN | Right | Right | 6' 6" | 200 lbs | $500,000 |
| Olds, Dale | C | San Fernando Bears | 23 | 12/01/2034 | Santa Ana | USA | Switch | Right | 5' 11" | 185 lbs | $500,000 |
| Olivares, Marcus | SP | Chicago Black Sox | 29 | 08/11/2029 | Memphis | USA | Right | Right | 6' 6" | 200 lbs | $3,500,000 |
| Olivarez, Juan | RP | Free Agent | 34 | 11/01/2024 | Volcan | PAN | Right | Right | 6' 0" | 190 lbs | - |
| Olivas, Carlos | SP | Mexico City Aztecs | 34 | 07/10/2024 | Jérez | MEX | Left | Right | 6' 4" | 195 lbs | $3,250,000 |
| Oliver, John | CF | Montreal Blazers | 33 | 08/24/2025 | Saint-Hyacinthe | CAN | Left | Right | 6' 2" | 185 lbs | $1,280,000 |
| Oliver, Juan | RP | Free Agent | 32 | 05/23/2026 | Campbell | USA | Right | Right | 5' 10" | 190 lbs | - |
| Ollier, Émile | LF | Chicago Black Sox | 31 | 02/18/2027 | Port-au-Prince | HAI | Right | Right | 6' 2" | 200 lbs | $750,000 |
| Omar, Ahmad | SP | Yellow Springs Nine | 17 | 06/06/2041 | Alexandria | EGY | Right | Left | 6' 5" | 190 lbs | - |
| Omar, Saleh | SS | Charlotte Flyers | 25 | 11/05/2033 | Juniyah | LIB | Right | Right | 6' 1" | 195 lbs | $500,000 |
| Omeragic, Slobodan | SP | Phoenix Talons | 29 | 11/24/2028 | Ulcinj | MON | Switch | Right | 6' 3" | 200 lbs | $3,600,000 |
| Ong, Bao-tian | LF | Mexico City Aztecs | 18 | 01/07/2040 | Xinyu | CHN | Left | Left | 6' 5" | 195 lbs | - |
| Onicescu, Stefan | SP | Charlotte Flyers | 17 | 08/23/2041 | Vaslui | ROM | Switch | Right | 6' 0" | 170 lbs | - |
| Orga, Dilaver | SP | Charlotte Flyers | 19 | 02/01/2039 | Diyarbakir | TUR | Right | Right | 6' 1" | 170 lbs | - |
| Orozco, José | SP | Long Beach Surfers | 19 | 03/31/2039 | Santiago | CHI | Right | Right | 6' 1" | 175 lbs | - |
| Orpen, Neil | SP | Hawaii Tropics | 17 | 08/01/2041 | North Shore | NZL | Right | Right | 5' 11" | 160 lbs | - |
| Ortíz, Francisco | SP | Bikini Krill | 33 | 01/10/2025 | Delgado | SLV | Right | Right | 6' 2" | 195 lbs | $900,000 |
| Ortíz, Manny | SP | Hawaii Tropics | 27 | 03/27/2031 | Camargo | MEX | Left | Right | 6' 1" | 200 lbs | $500,000 |
| Ortíz, Raúl | SP | Free Agent | 29 | 03/22/2029 | Puebla | MEX | Right | Right | 5' 10" | 190 lbs | - |
| Ortíz, Vicente | SP | San Fernando Bears | 16 | 05/21/2042 | La Dorada | COL | Left | Left | 6' 2" | 175 lbs | - |
| Osmani, Rao | SP | Montreal Blazers | 17 | 08/19/2041 | Daska | PAK | Left | Left | 5' 11" | 160 lbs | - |
| Ostrom, Frank | RP | Madison Wolves | 30 | 11/05/2028 | Trois-Rivières | CAN | Right | Right | 6' 6" | 200 lbs | $500,000 |
| Ottaway, Bradley | SP | Free Agent | 32 | 11/17/2025 | Melbourne | AUS | Right | Right | 6' 4" | 200 lbs | - |
| Owbridge, Jeremy | 2B | San Antonio Outlaws | 34 | 06/19/2024 | Hobart | AUS | Switch | Right | 6' 1" | 200 lbs | $13,600,000 |
| Owens, Gary | SP | Free Agent | 29 | 11/19/2028 | Binghamton | USA | Left | Left | 6' 5" | 205 lbs | - |
