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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| O'Day, Mike | RP | Los Angeles Agents | 28 | 10/28/2026 | Platteville | USA | Left | Right | 6' 6" | 200 lbs | $350,000 |
| O'Day, Ray | RF | Los Angeles Agents | 32 | 04/09/2023 | Artesia | USA | Right | Right | 6' 4" | 205 lbs | $10,000,000 |
| O'Flattery, Danny | 3B | Greenfield Cougars | 24 | 12/01/2030 | Danville | USA | Right | Right | 5' 10" | 175 lbs | $350,000 |
| O'Halloran, Dave | LF | El Paso Apaches | 30 | 02/04/2025 | Newport Beach | USA | Left | Left | 6' 7" | 205 lbs | $808,000 |
| O'Neill, Manny | LF | South Fork Frogs | 38 | 01/02/2017 | Bothell | USA | Left | Left | 6' 4" | 200 lbs | $4,140,000 |
| O'Quinlevan, David | RP | New Orleans Crawdads | 31 | 10/20/2023 | Lafayette | USA | Right | Right | 6' 2" | 200 lbs | $350,000 |
| O'Sullivan, Gary | SP | Austin Aces | 35 | 10/02/2019 | Los Angeles | USA | Right | Right | 6' 0" | 200 lbs | $15,000,000 |
| Odom, Rob | SP | Greenville Spinners | 33 | 11/08/2021 | Pueblo | USA | Left | Right | 6' 0" | 200 lbs | $9,500,000 |
| Ofeda, Cisco | CF | Free Agent | 16 | 07/16/2038 | Valencia | VEN | Right | Left | 6' 1" | 165 lbs | - |
| Oglethorpe, Peter | SP | Bronx Warriors | 28 | 06/21/2026 | Davenport | USA | Left | Left | 5' 10" | 195 lbs | $350,000 |
| Oh, Myun-gu | 2B | Free Agent | 30 | 02/14/2025 | Gyeongsan | KOR | Right | Right | 6' 1" | 200 lbs | - |
| Olivas, José | RP | New Orleans Crawdads | 26 | 06/05/2028 | León | MEX | Right | Right | 6' 6" | 200 lbs | $350,000 |
| Olivas, Manuel | SS | Free Agent | 16 | 09/06/2038 | Boca Chica | DOM | Right | Right | 6' 2" | 175 lbs | - |
| Olvera, Jorge | 2B | Noblesville Millers | 26 | 06/17/2028 | Santo Domingo | DOM | Right | Right | 6' 0" | 195 lbs | $3,060,000 |
| Olvera, Víctor | SP | Seattle Reign | 33 | 11/23/2021 | Boca Chica | DOM | Right | Right | 5' 10" | 200 lbs | $750,000 |
| Ondaro, Jesús | SP | Los Angeles Agents | 19 | 02/07/2036 | Puerto la Cruz | VEN | Left | Right | 6' 1" | 165 lbs | - |
| Oneto, Santiago | CF | San Jose Quakes | 17 | 05/04/2037 | Caracas | VEN | Right | Right | 6' 0" | 165 lbs | - |
| Ontiveros, Miguel Angel | SP | San Jose Quakes | 17 | 12/07/2037 | Santo Domingo | DOM | Right | Right | 6' 2" | 175 lbs | - |
| Ontiveros, Roberto | LF | San Jose Quakes | 25 | 08/02/2029 | Maracaibo | VEN | Right | Right | 6' 4" | 200 lbs | $350,000 |
| Orosco, José | RP | San Diego Storm | 33 | 02/13/2022 | Havana | CUB | Right | Left | 6' 1" | 200 lbs | $5,040,000 |
| Orozco, Diego | SP | Free Agent | 33 | 04/01/2022 | Santo Domingo | DOM | Right | Right | 6' 0" | 170 lbs | - |
| Orr, Bill | CL | San Jose Quakes | 35 | 10/10/2019 | Levittown | USA | Right | Right | 6' 0" | 200 lbs | $4,400,000 |
| Ortega, Ernesto | 3B | Free Agent | 16 | 06/30/2038 | La Romana | DOM | Right | Right | 5' 11" | 175 lbs | - |
| Ortega, Juan | SP | Seattle Reign | 30 | 01/09/2025 | Puerto Plata | DOM | Right | Right | 5' 11" | 190 lbs | $14,500,000 |
| Ortíz, Germán | RF | Free Agent | 16 | 12/22/2038 | Santo Domingo | DOM | Left | Left | 6' 1" | 180 lbs | - |
| Ortíz, José | C | Boston Shamrocks | 19 | 09/02/2035 | San Pedro de Macorís | DOM | Right | Right | 6' 4" | 205 lbs | - |
| Ortíz, Rafael | C | Noblesville Millers | 27 | 06/14/2027 | Havana | CUB | Left | Right | 6' 2" | 200 lbs | $350,000 |
| Ortíz, Ángel | SP | Boston Shamrocks | 19 | 04/19/2036 | Tocumen | PAN | Right | Right | 6' 4" | 190 lbs | - |
| Owen, John | 1B | Macon Bacon | 25 | 06/14/2029 | Chicago | USA | Left | Left | 6' 0" | 200 lbs | $350,000 |
