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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| O'connell, Kelvin | RP | Free Agent | 18 | 04/02/2033 | Brisbane | AUS | Left | Left | 6' 2" | 170 lbs | - |
| O'Duff, Wilber | LF | Free Agent | 33 | 08/30/2018 | Waterford Township | USA | Right | Right | 6' 0" | 200 lbs | - |
| O'Grady, Allen | SS | Cozumel Reef Divers | 31 | 08/03/2020 | Ft. Worth | USA | Left | Right | 5' 9" | 175 lbs | $400,000 |
| O'Neal, Nate | LF | Lubbock Green Sox | 26 | 03/23/2025 | Napa | USA | Right | Right | 6' 3" | 200 lbs | $4,684,000 |
| O'Slattery, Chad | SP | St. Charles Sheens | 26 | 06/02/2025 | Fremont | USA | Left | Right | 6' 5" | 190 lbs | $4,334,400 |
| Odiinkemelu, Semer | RP | Free Agent | 18 | 03/05/2033 | Durban | RSA | Right | Right | 6' 5" | 195 lbs | - |
| Oelsner, Thorsten | RP | Free Agent | 20 | 11/10/2030 | Leipzig | GER | Right | Right | 6' 3" | 195 lbs | - |
| Ohayashi, Tsurayuki | 2B | Free Agent | 19 | 03/06/2032 | Osaka | JPN | Right | Right | 6' 1" | 175 lbs | - |
| Ojito, Israel | RP | Free Agent | 18 | 03/01/2033 | Maracaibo | VEN | Right | Right | 5' 9" | 155 lbs | - |
| Olatunji, Smail | SP | Free Agent | 29 | 10/01/2022 | Mooi River | RSA | Right | Left | 6' 4" | 200 lbs | - |
| Olivares, Cipriano | SP | Lubbock Green Sox | 16 | 10/25/2034 | Santo Domingo | DOM | Left | Left | 6' 5" | 190 lbs | - |
| Olivares, Luis | 1B | Free Agent | 35 | 09/05/2016 | Rolling Meadows | USA | Right | Right | 6' 4" | 200 lbs | - |
| Olivas, Juan | 3B | Free Agent | 32 | 11/10/2018 | Jarabacoa | DOM | Right | Right | 6' 3" | 215 lbs | - |
| Oliver, Eric | RP | Free Agent | 32 | 10/24/2018 | New York | USA | Right | Right | 6' 2" | 200 lbs | - |
| Oliver, Jason | 2B | Chicago Machine | 26 | 04/14/2025 | Jefferson City | USA | Right | Right | 6' 2" | 200 lbs | $2,800,000 |
| Oliver, Stephen | C | Free Agent | 26 | 07/13/2025 | Castlemaine | AUS | Right | Right | 6' 1" | 200 lbs | - |
| Olsen, Todd | C | Free Agent | 29 | 06/15/2022 | New York | USA | Right | Right | 6' 2" | 200 lbs | - |
| Olson, Chris | 3B | Cozumel Reef Divers | 36 | 10/29/2014 | La Quinta | USA | Left | Right | 6' 3" | 200 lbs | $900,000 |
| Olson, Dan | SP | Yonkers Yetis | 24 | 12/25/2026 | Chattanooga | USA | Switch | Left | 6' 0" | 185 lbs | $10,746,000 |
| Olson, Jeff | C | Free Agent | 21 | 02/21/2030 | Centennial | USA | Right | Right | 6' 3" | 205 lbs | - |
| Olson, Jeffrey | RP | Free Agent | 24 | 01/17/2027 | Greenwich | USA | Left | Left | 6' 6" | 200 lbs | - |
| Olvera, Román | SP | St. Charles Sheens | 19 | 05/10/2032 | Santo Domingo | DOM | Left | Left | 5' 10" | 160 lbs | - |
| Onishi, Juichi | C | Boston Rebels | 29 | 09/01/2022 | Hanno | JPN | Right | Right | 6' 0" | 205 lbs | $600,000 |
| Ornelas, José | LF | Manchester Foxes | 19 | 02/07/2032 | San Juan | PUR | Right | Right | 6' 7" | 215 lbs | - |
| Orosco, Carlos | CF | St. Charles Sheens | 19 | 11/09/2031 | Guarenas | VEN | Right | Right | 6' 2" | 180 lbs | - |
| Orosco, Enrico | 1B | Cozumel Reef Divers | 19 | 05/16/2032 | Los Llanos | DOM | Right | Right | 6' 4" | 200 lbs | - |
| Orozco, Jaime | RF | Yonkers Yetis | 19 | 07/18/2032 | San Antonio | CRC | Right | Left | 6' 1" | 185 lbs | - |
| Ortega, António | SP | Yonkers Yetis | 18 | 08/17/2033 | Hato Mayor | DOM | Right | Right | 6' 1" | 180 lbs | - |
| Ortega, Fernando | RF | St. Louis Browns | 19 | 11/04/2031 | San Cristóbal | DOM | Right | Right | 6' 2" | 185 lbs | - |
| Ortega, Raúl | SP | Chicago Machine | 16 | 12/31/2034 | Caracas | VEN | Right | Right | 6' 1" | 170 lbs | - |
| Ortíz, Alberto | LF | Free Agent | 18 | 12/18/2032 | Maracaibo | VEN | Right | Right | 6' 1" | 190 lbs | - |
| Ortíz, Alejandro | 1B | Cozumel Reef Divers | 19 | 11/16/2031 | Maracaibo | VEN | Right | Right | 6' 5" | 200 lbs | - |
| Ortíz, Alonso | SP | Charm City Baysox | 19 | 10/07/2031 | La Dolorita | VEN | Switch | Right | 6' 8" | 200 lbs | - |
| Ortíz, António | SS | Kansas City Kings | 16 | 07/30/2035 | Villa Bisonó | DOM | Right | Right | 6' 0" | 170 lbs | - |
| Ortíz, Eduardo | RF | Free Agent | 20 | 08/06/2031 | Santo Domingo | DOM | Right | Right | 6' 2" | 185 lbs | - |
| Ortíz, Esteban | SP | Minnesota North Stars | 17 | 11/29/2033 | San José de Ocoa | DOM | Left | Left | 6' 5" | 195 lbs | - |
| Ortíz, Fernando | RP | Free Agent | 20 | 01/29/2031 | Santiago de María | SLV | Switch | Right | 6' 6" | 190 lbs | - |
| Ortíz, Germán | RP | Seattle Admirals | 17 | 10/01/2034 | La Romana | DOM | Right | Right | 6' 1" | 170 lbs | - |
| Ortíz, Jesús | SS | Maui Wave | 16 | 01/26/2035 | San Francisco de Macorís | DOM | Right | Right | 6' 2" | 170 lbs | - |
| Ortíz, Jesús | C | Free Agent | 20 | 03/23/2031 | Consuelo | DOM | Right | Right | 6' 0" | 185 lbs | - |
| Ortíz, José | RP | Free Agent | 20 | 03/09/2031 | Chame | PAN | Right | Right | 5' 10" | 165 lbs | - |
| Ortíz, Juan | SP | Free Agent | 34 | 05/22/2017 | Jacksonville | USA | Left | Left | 6' 0" | 190 lbs | - |
| Ortíz, Júlio | 3B | Free Agent | 34 | 06/26/2017 | Nogales | MEX | Right | Right | 6' 0" | 155 lbs | - |
| Ortíz, Luis | SP | Jersey Shore D-Bags | 19 | 08/24/2032 | Baní | DOM | Right | Right | 6' 8" | 205 lbs | - |
| Ortíz, Miguel | SP | Free Agent | 18 | 09/01/2033 | Barinas | VEN | Right | Right | 6' 1" | 175 lbs | - |
| Ortíz, Norberto | SP | Phoenix Firebirds | 16 | 12/29/2034 | Guaynabo | PUR | Right | Right | 6' 3" | 180 lbs | - |
| Ortíz, Octávio | SP | Manchester Foxes | 19 | 04/27/2032 | Hato Mayor | DOM | Left | Left | 6' 0" | 175 lbs | - |
| Ortíz, Pedro | C | Irvine Gang Green | 17 | 05/16/2034 | Santo Domingo | DOM | Switch | Right | 6' 0" | 190 lbs | - |
| Ortíz, Tony | RP | Free Agent | 24 | 07/22/2027 | Chicago | USA | Left | Left | 6' 9" | 200 lbs | - |
| Osborne, Bob | LF | Free Agent | 21 | 10/09/2029 | Hamtramck | USA | Left | Right | 5' 11" | 180 lbs | - |
| Ouellet, Curtis | RP | Seattle Admirals | 25 | 10/11/2025 | Calgary | CAN | Left | Left | 5' 11" | 185 lbs | $1,320,000 |
| Owens, Archie | RP | Lubbock Green Sox | 30 | 03/12/2021 | Las Vegas | USA | Right | Left | 6' 1" | 195 lbs | $1,090,000 |
| Owens, George | RP | Nashville G-Strings | 27 | 06/10/2024 | Los Angeles | USA | Right | Right | 6' 2" | 195 lbs | $400,000 |
| Owens, George | 1B | Free Agent | 26 | 02/04/2025 | Grafton | USA | Right | Right | 6' 6" | 210 lbs | - |
| Owens, Jeremy | 3B | Columbus Coalition | 26 | 06/10/2025 | Worcester | USA | Right | Right | 6' 6" | 200 lbs | $400,000 |
| Owens, Paul | C | Charleston RubberDucks | 29 | 10/02/2022 | St. George | USA | Right | Right | 6' 1" | 200 lbs | $750,000 |
| Owens, Ryan | 2B | Maui Wave | 21 | 03/05/2030 | Brownsville | USA | Left | Right | 6' 0" | 165 lbs | $400,000 |
