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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| O'Born, Joe | SP | Kyiv Cossacks | 24 | 07/09/2028 | Newport News | USA | Right | Right | 6' 2" | 195 lbs | $545,000 |
| O'Brien, Erik | 2B | Free Agent | 20 | 03/12/2033 | Midleton | IRL | Switch | Right | 6' 2" | 185 lbs | - |
| O'Brien, Keane | CF | Free Agent | 18 | 03/26/2035 | Skerries | IRL | Switch | Right | 6' 1" | 180 lbs | - |
| O'Brien, Killian | 3B | Detroit Pizzas | 16 | 12/26/2036 | Birr | IRL | Right | Right | 5' 11" | 170 lbs | - |
| O'Neill, Darragh | SP | Dublin Porters | 18 | 05/21/2035 | Cork | IRL | Left | Left | 5' 10" | 170 lbs | - |
| O'Neill, Gair | SP | Havana Sugar Kings | 19 | 11/03/2033 | Dublin | IRL | Right | Right | 5' 11" | 175 lbs | - |
| O'Sullivan, Darragh | 2B | Free Agent | 20 | 04/03/2033 | Galway | IRL | Left | Right | 6' 0" | 170 lbs | - |
| Ocampo, Tim | RP | Buffalo Buffalo | 34 | 07/25/2018 | Dallas | USA | Right | Right | 5' 10" | 200 lbs | $4,750,000 |
| Ocejo, Pablo | 1B | Hanoi Dragon Warriors | 16 | 12/17/2036 | Caracas | VEN | Right | Right | 6' 2" | 200 lbs | - |
| Ocon, Mario | SP | Kyiv Cossacks | 17 | 05/27/2036 | Santo Domingo | DOM | Left | Right | 6' 1" | 175 lbs | - |
| Ogas, Carlos | SP | Arizona Scorpions | 17 | 08/12/2035 | Mao | DOM | Right | Right | 5' 11" | 170 lbs | - |
| Olalde, Sergio | C | Free Agent | 19 | 04/09/2034 | Havana | CUB | Switch | Right | 6' 6" | 210 lbs | - |
| Oliva, Alexis | SP | Dublin Porters | 18 | 03/15/2035 | San Cristóbal | DOM | Right | Right | 6' 0" | 170 lbs | - |
| Olmeda, Dave | CF | Free Agent | 18 | 12/03/2034 | San Francisco de Macorís | DOM | Right | Right | 6' 3" | 180 lbs | - |
| Olmedo, Marcos | 1B | Kyiv Cossacks | 16 | 12/10/2036 | Higüey | DOM | Right | Right | 6' 0" | 180 lbs | - |
| Olson, Billy | 1B | Havana Sugar Kings | 26 | 09/16/2026 | Kenova | USA | Right | Right | 6' 2" | 205 lbs | $9,016,000 |
| Orellana, Mario | SP | St. Louis Archies | 19 | 02/07/2034 | La Concepción | NCA | Left | Left | 6' 1" | 180 lbs | - |
| Orellana, Tony | RP | East Haddam Hyenas | 30 | 12/14/2022 | McAllen | USA | Right | Right | 6' 6" | 215 lbs | $1,200,000 |
| Orozco, Marco | SP | Arizona Scorpions | 16 | 12/02/2036 | Maracaibo | VEN | Right | Right | 6' 0" | 170 lbs | - |
| Ortega, Jerry | SP | St. Louis Archies | 24 | 04/12/2029 | Maracaibo | VEN | Switch | Right | 6' 2" | 190 lbs | - |
| Ortega, Ramon | SP | Yellowstone Super Volcano | 18 | 06/01/2035 | Puerto Plata | DOM | Right | Right | 6' 0" | 175 lbs | - |
| Ortega, Ricardo | RP | Free Agent | 17 | 05/18/2036 | Bonao | DOM | Right | Right | 6' 2" | 180 lbs | - |
| Ortiz, Alex | LF | Free Agent | 19 | 12/01/2033 | Santo Domingo | DOM | Right | Right | 6' 1" | 195 lbs | - |
| Ortiz, Carlos | SS | Havana Sugar Kings | 18 | 10/07/2034 | San Buenaventura | MEX | Right | Right | 6' 1" | 175 lbs | - |
| Ortiz, Danny | 1B | St. Louis Archies | 17 | 12/02/2035 | Caracas | VEN | Right | Right | 6' 4" | 210 lbs | - |
| Ortiz, Danny | 2B | Wilmington Blue Rocks | 28 | 06/18/2024 | Santo Domingo | DOM | Right | Right | 5' 11" | 205 lbs | $4,765,200 |
| Ortiz, John | SP | Waikiki Wayfinders | 17 | 01/22/2036 | Trujillo | VEN | Left | Left | 6' 1" | 175 lbs | - |
| Ortiz, Manuel | SP | Waikiki Wayfinders | 17 | 08/17/2035 | Santo Domingo | DOM | Right | Right | 5' 11" | 165 lbs | - |
| Osadchenko, Lukyan | RP | Free Agent | 19 | 10/24/2033 | Kiev | UKR | Right | Right | 6' 0" | 170 lbs | - |
| Ostapowicz, Rich | 1B | Detroit Pizzas | 28 | 12/24/2024 | Stanford | USA | Right | Right | 6' 2" | 210 lbs | $1,000,000 |
| Ouchi, Shuhei | RP | St. Louis Archies | 34 | 02/09/2019 | Miyakonojo | JPN | Left | Left | 6' 0" | 205 lbs | $28,000,000 |
