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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| O'Boye, Leroy | RF | Toronto Blue Jays | 18 | 07/10/2033 | Brisbane | AUS | Left | Left | 6' 2" | 195 lbs | - |
| O'Brien, Ethan | SP | Free Agent | 17 | 09/04/2034 | Norfolk | USA | Right | Right | 6' 3" | 175 lbs | - |
| O'Brien, Pascal | CL | Free Agent | 21 | 05/26/2031 | Ardmore | USA | Left | Right | 6' 0" | 180 lbs | - |
| O'Conner, Kennedy | SP | Free Agent | 17 | 07/20/2034 | Warwick | USA | Switch | Right | 6' 1" | 170 lbs | - |
| O'Connor, Owen | SP | Free Agent | 16 | 09/25/2035 | Regina | CAN | Right | Right | 6' 1" | 175 lbs | - |
| O'Hara, Josef | SP | St. Louis Cardinals | 34 | 05/13/2018 | Roswell | USA | Left | Left | 5' 11" | 200 lbs | $500,000 |
| O'Neal, Gino | SP | Free Agent | 28 | 10/09/2023 | Arlington | USA | Right | Right | 5' 10" | 185 lbs | - |
| O'Neil, Alexander | SP | Free Agent | 38 | 08/21/2013 | Jefferson | USA | Switch | Right | 6' 2" | 200 lbs | - |
| O'Reilly, Duncan | SP | Chicago Cubs | 25 | 07/21/2026 | Philadelphia | USA | Right | Left | 6' 1" | 190 lbs | $500,000 |
| Obregon, Diego | LF | Miami Marlins | 18 | 08/20/2033 | Santiago | DOM | Switch | Right | 6' 3" | 190 lbs | - |
| Obregon, Yenier | 3B | Free Agent | 28 | 12/04/2023 | Bogota | COL | Right | Right | 5' 10" | 180 lbs | - |
| Ocampo, Achillio | 2B | Free Agent | 28 | 12/16/2023 | Santo Domingo | DOM | Right | Right | 6' 1" | 200 lbs | - |
| Ocanas, Nathan | C | Free Agent | 29 | 06/07/2022 | Salisbury | USA | Left | Right | 6' 6" | 195 lbs | - |
| Ocanas, Wilfredo | LF | California Angels | 24 | 01/21/2028 | Valencia | VEN | Left | Left | 6' 1" | 175 lbs | $500,000 |
| Oceguera, Antonio | 3B | Free Agent | 20 | 09/24/2031 | San Juan | PUR | Right | Right | 6' 1" | 200 lbs | - |
| Oceguera, Mario | 1B | Oakland Athletics | 17 | 05/23/2035 | Santiago | DOM | Right | Right | 6' 2" | 200 lbs | - |
| Ochoa, Andrés | CF | Montreal Expos | 18 | 09/03/2033 | Placetas | CUB | Right | Right | 6' 4" | 190 lbs | - |
| Ochoa, Chandler | SP | Chicago White Sox | 18 | 09/16/2033 | Vidalia | USA | Right | Right | 6' 2" | 185 lbs | - |
| Ochoa, Fulgencio | RP | Vancouver Cascades | 28 | 05/07/2024 | Maturín | VEN | Right | Right | 6' 2" | 195 lbs | $2,300,000 |
| Ochoa, Victor | SP | Free Agent | 17 | 11/07/2034 | Carbondale | USA | Right | Right | 5' 11" | 165 lbs | - |
| Oesterling, Romolo | SP | Milwaukee Brewers | 36 | 01/13/2016 | Aurora | USA | Left | Left | 5' 10" | 195 lbs | $1,000,000 |
| Okada, Kiwara | CF | Free Agent | 20 | 06/06/2031 | Seki | JPN | Right | Right | 6' 0" | 195 lbs | - |
| Okubo, Katsuya | C | Free Agent | 15 | 09/24/2036 | Tokyo | JPN | Left | Right | 6' 0" | 180 lbs | - |
| Olguin, Antony | LF | Cleveland Indians | 24 | 06/05/2027 | Filas de Mariche | VEN | Right | Left | 6' 4" | 200 lbs | $500,000 |
| Olinger, Ian | SP | Free Agent | 32 | 10/31/2019 | Colville | USA | Right | Right | 6' 8" | 200 lbs | - |
| Oliu, Juan | DH | Fresno Falcons | 28 | 05/30/2024 | Santo Domingo | DOM | Left | Left | 6' 2" | 205 lbs | $22,800,000 |
| Olivarez, Junior | SP | Kansas City Royals | 19 | 09/19/2032 | Maiquetía | VEN | Left | Left | 6' 0" | 180 lbs | - |
| Oliver, Caleb | RF | Memphis Blues | 26 | 07/05/2025 | Brooklyn | USA | Left | Left | 6' 6" | 200 lbs | $16,250,000 |
| Olmstead, Shon | SP | Free Agent | 17 | 04/13/2035 | Redlands | USA | Switch | Right | 6' 4" | 185 lbs | - |
| Olson, Christopher | RP | Free Agent | 16 | 04/27/2036 | Hays | USA | Right | Right | 6' 9" | 200 lbs | - |
| Olson, Ezekiel | SP | Free Agent | 17 | 01/25/2035 | Albuquerque | USA | Right | Right | 6' 0" | 165 lbs | - |
| Olson, Jonathan | SP | New York Yankees | 31 | 05/18/2021 | Hazel Dell South | USA | Right | Right | 6' 1" | 195 lbs | $500,000 |
| Olson, Julian | LF | Seattle Mariners | 30 | 12/16/2021 | Chicago | USA | Switch | Right | 6' 4" | 200 lbs | - |
| Olson, Morton | C | Free Agent | 17 | 09/10/2034 | Dallas | USA | Right | Right | 6' 1" | 190 lbs | - |
| Ong, Greg | RP | Pittsburgh Pirates | 27 | 07/12/2024 | Fruit Cove | USA | Left | Left | 6' 3" | 205 lbs | $500,000 |
| Ontiveros, Sebastian | DH | Detroit Tigers | 26 | 02/14/2026 | Houston | USA | Left | Left | 5' 11" | 190 lbs | $6,156,000 |
| Orange, Lann | SP | Texas Rangers | 24 | 11/07/2027 | Freeport | USA | Right | Right | 6' 8" | 200 lbs | $500,000 |
| Ordonez, Gerald | RP | Free Agent | 17 | 09/21/2034 | Norfolk | USA | Right | Left | 6' 5" | 195 lbs | - |
| Orduna, Sergio | SS | Free Agent | 17 | 10/14/2034 | Valencia | VEN | Right | Right | 6' 0" | 165 lbs | - |
| Orellana, Patton | SP | San Diego Padres | 18 | 02/08/2034 | Villa Tapia | DOM | Left | Left | 6' 6" | 195 lbs | - |
| Orozco, Bobby | LF | Kansas City Royals | 30 | 05/05/2022 | Towson | USA | Left | Right | 6' 6" | 200 lbs | $500,000 |
| Orozco, Maximiliano | 3B | Virginia Black Bears | 17 | 01/14/2035 | San José de Guanipa | VEN | Right | Right | 6' 2" | 180 lbs | - |
| Orta, Freddie | SP | Free Agent | 17 | 06/24/2034 | Egypt Lake-Leto | USA | Left | Right | 6' 2" | 175 lbs | - |
| Ortiz, Aarón | LF | Free Agent | 25 | 08/08/2026 | Cagua | VEN | Right | Right | 6' 3" | 205 lbs | - |
| Ortiz, Bibiano | LF | Miami Marlins | 17 | 05/01/2035 | Gaspar Hernandez | DOM | Right | Right | 5' 10" | 165 lbs | - |
| Ortiz, Jordi | 3B | Minnesota Twins | 29 | 03/13/2023 | Bayaguana | DOM | Right | Right | 6' 0" | 205 lbs | $11,500,000 |
| Ortiz, K.J. | SP | Free Agent | 16 | 09/12/2035 | Toledo | USA | Left | Left | 6' 1" | 170 lbs | - |
| Ortiz, Leonel | CF | Chicago Cubs | 16 | 08/02/2035 | Maracaibo | VEN | Right | Right | 6' 3" | 180 lbs | - |
| Ortiz, Marco | RP | Miami Marlins | 30 | 01/17/2022 | Boca Chica | DOM | Right | Right | 5' 10" | 175 lbs | $2,400,000 |
| Ortiz, Ricky | SS | Chicago White Sox | 17 | 12/15/2034 | Santo Domingo | DOM | Right | Right | 6' 1" | 170 lbs | - |
| Ortiz, Roberto | SS | Toronto Blue Jays | 19 | 05/06/2033 | Manizales | COL | Left | Right | 6' 3" | 185 lbs | - |
| Osgood, Mark | SP | Free Agent | 17 | 12/11/2034 | Mechanicsville | USA | Right | Right | 6' 3" | 190 lbs | - |
| Osorio, Pedro | RP | Houston Astros | 29 | 09/15/2022 | Maracaibo | VEN | Right | Right | 6' 2" | 200 lbs | $4,200,000 |
| Osorio, Silvino | SP | Portland Hops | 18 | 06/19/2033 | Turmero | VEN | Right | Left | 6' 6" | 200 lbs | - |
| Otano, Roland | SP | Chicago Cubs | 26 | 06/11/2025 | Edgewood (Northumberland County) | USA | Right | Right | 6' 2" | 190 lbs | $4,210,000 |
| Otero, Izan | SP | Indianapolis Ignition | 16 | 06/30/2035 | Turmero | VEN | Left | Left | 6' 7" | 195 lbs | - |
| Otero, Ruben | CF | Boston Red Sox | 29 | 12/22/2022 | Florida | CUB | Right | Right | 6' 3" | 205 lbs | $3,360,000 |
| Ott, Billy | SP | Miami Marlins | 24 | 01/07/2028 | Brighton | USA | Right | Right | 6' 4" | 200 lbs | $500,000 |
| Ottman, Brian | 2B | Montreal Expos | 26 | 04/16/2026 | Downers Grove | USA | Right | Right | 6' 4" | 195 lbs | $500,000 |
| Ou, Ryan | 2B | Miami Marlins | 25 | 09/11/2026 | Olney | USA | Right | Right | 6' 2" | 200 lbs | $500,000 |
| Ouellet, Kyle | C | Free Agent | 17 | 02/07/2035 | Toronto | CAN | Right | Right | 6' 0" | 185 lbs | - |
| Ovalle, Felipe | LF | Free Agent | 18 | 01/20/2034 | Maracaibo | VEN | Right | Right | 6' 1" | 185 lbs | - |
| Owen, Adriel | SP | Pittsburgh Pirates | 27 | 09/23/2024 | Yonkers | USA | Right | Right | 6' 7" | 200 lbs | $1,850,000 |
| Owen, Calvin | SP | San Diego Padres | 32 | 03/14/2020 | Wooster | USA | Right | Right | 6' 2" | 200 lbs | $1,000,000 |
| Owen, Jared | C | Free Agent | 17 | 01/26/2035 | Patton Village | USA | Right | Right | 6' 2" | 190 lbs | - |
| Owens, Doyle | 3B | Free Agent | 17 | 04/11/2035 | Parole | USA | Right | Right | 6' 2" | 175 lbs | - |
| Owens, Mike | 2B | Free Agent | 17 | 06/26/2034 | Dallas | USA | Right | Right | 6' 3" | 185 lbs | - |
| Owens, Quincy | LF | Indianapolis Ignition | 27 | 07/27/2024 | Hendersonville | USA | Right | Right | 6' 6" | 200 lbs | $1,150,000 |
| Owsley, Wyatt | SP | Free Agent | 17 | 06/13/2034 | Plymouth | USA | Left | Left | 6' 5" | 185 lbs | - |
