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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| O'Brien, Erik | 2B | St. Louis Archies | 17 | 03/12/2033 | Midleton | IRL | Switch | Right | 6' 2" | 180 lbs | - |
| O'Neill, Gair | SP | Havana Sugar Kings | 16 | 11/03/2033 | Dublin | IRL | Right | Right | 5' 11" | 170 lbs | - |
| O'Sullivan, Darragh | 2B | Arizona Desert Storm | 17 | 04/03/2033 | Galway | IRL | Left | Right | 6' 0" | 170 lbs | - |
| O'Sullivan, Maccon | SS | Arizona Desert Storm | 17 | 04/13/2033 | Rush | IRL | Right | Right | 6' 1" | 175 lbs | - |
| Ocampo, Tim | SP | Buffalo Buffalo | 31 | 07/25/2018 | Dallas | USA | Right | Right | 5' 10" | 195 lbs | $11,500,000 |
| Ocasio, Jon | SP | Hanoi Dragon Warriors | 19 | 06/04/2030 | San Pedro de Macorís | DOM | Right | Right | 5' 11" | 170 lbs | - |
| Ochoa, Victor | LF | East Haddam Hyenas | 28 | 05/23/2021 | Nagua | DOM | Left | Left | 5' 11" | 190 lbs | $545,000 |
| Ochoa, Vinny | RP | Hanoi Dragon Warriors | 27 | 08/05/2022 | El Vigía | VEN | Right | Right | 6' 4" | 205 lbs | $545,000 |
| Odeneal, Chris | 2B | Arizona Desert Storm | 27 | 07/27/2022 | Lincoln | USA | Right | Right | 6' 4" | 205 lbs | $545,000 |
| Ogando, Alex | SP | St. Louis Archies | 19 | 03/06/2031 | Santiago | DOM | Right | Right | 6' 2" | 185 lbs | - |
| Oh, Ki-tak | RP | Free Agent | 17 | 07/14/2032 | Seoul | KOR | Left | Right | 6' 3" | 190 lbs | - |
| Olson, Billy | RF | Havana Sugar Kings | 23 | 09/16/2026 | Kenova | USA | Right | Right | 6' 2" | 205 lbs | $545,000 |
| Olveda, Nick | 2B | Los Angeles Kings | 32 | 11/21/2017 | New York | USA | Left | Right | 6' 3" | 200 lbs | $16,000,000 |
| Onstein, Teune | SP | Havana Sugar Kings | 17 | 10/11/2032 | Willemstad | CUR | Left | Left | 6' 2" | 180 lbs | - |
| Ontiveros, Carlos | SP | Yellowstone Super Volcano | 17 | 11/27/2032 | Santo Domingo | DOM | Left | Left | 6' 1" | 175 lbs | - |
| Ontiveros, Jesus | SP | Los Angeles Kings | 18 | 04/05/2032 | Ciudad Guayana | VEN | Right | Left | 5' 11" | 165 lbs | - |
| Orama, Nelson | RP | Kyiv Cossacks | 25 | 10/23/2024 | Caracas | VEN | Left | Right | 6' 5" | 200 lbs | $545,000 |
| Orellana, Mario | SP | St. Louis Archies | 16 | 02/07/2034 | La Concepción | NCA | Left | Left | 6' 1" | 175 lbs | - |
| Orellana, Tony | RP | Portland Beavers | 27 | 12/14/2022 | McAllen | USA | Right | Right | 6' 6" | 205 lbs | $545,000 |
| Orocio, Juan | 3B | Arizona Desert Storm | 19 | 02/04/2031 | Apodaca | MEX | Right | Right | 6' 1" | 185 lbs | - |
| Orta, Juan | RP | Buffalo Buffalo | 17 | 03/11/2033 | Santo Domingo | DOM | Right | Right | 6' 4" | 195 lbs | - |
| Ortega, Felix | SP | Kyiv Cossacks | 17 | 10/14/2032 | Valencia | VEN | Left | Right | 6' 2" | 185 lbs | - |
| Ortega, Mike | 1B | Dublin Porters | 18 | 07/25/2031 | San Francisco de Macorís | DOM | Left | Left | 6' 4" | 210 lbs | - |
| Ortiz, Danny | 2B | Brooklyn Knights | 25 | 06/18/2024 | Santo Domingo | DOM | Right | Right | 5' 11" | 195 lbs | $545,000 |
| Ortiz, Willie | RF | Osaka Takoyaki | 17 | 07/12/2032 | Telchac | MEX | Right | Right | 5' 11" | 170 lbs | - |
| Osorio, Juan | SP | Waikiki Wayfinders | 18 | 08/02/2031 | San Antonio de los Altos | VEN | Right | Right | 5' 10" | 170 lbs | - |
| Oswald, Jesse | CF | Dublin Porters | 26 | 12/02/2023 | Mansfield Center | USA | Switch | Right | 6' 2" | 200 lbs | $545,000 |
| Ouchi, Shuhei | SP | St. Louis Archies | 31 | 02/09/2019 | Miyakonojo | JPN | Left | Left | 6' 0" | 200 lbs | $32,000,000 |
