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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Obropta, Miguel Angel | SP | California Dreamers | 19 | 02/22/2032 | Maracaibo | VEN | Right | Right | 6' 0" | 180 lbs | - |
| Ochoa, José | LF | Free Agent | 33 | 01/21/2018 | Lake Elsinore | USA | Right | Right | 6' 4" | 200 lbs | - |
| Okazaki, Yoshihasa | 2B | Free Agent | 34 | 03/28/2017 | Ichinoseki | JPN | Right | Right | 6' 3" | 200 lbs | - |
| Olenik, Rob | 3B | Philadelphia Liberty | 23 | 08/18/2028 | Des Moines | USA | Left | Right | 6' 3" | 185 lbs | $455,000 |
| Olenik, Walt | SP | Nashville Outlaws | 34 | 03/21/2017 | Hazardville | USA | Left | Left | 6' 2" | 205 lbs | $955,000 |
| Olival, Sílvio | RP | California Dreamers | 23 | 01/16/2028 | Ciudad Guayana | VEN | Left | Left | 6' 8" | 205 lbs | $455,000 |
| Olivella, Ángelo | SS | Free Agent | 30 | 05/28/2021 | Lansdowne-Baltimore Highlands | USA | Left | Right | 6' 2" | 200 lbs | - |
| Oltman, Bob | RP | Minneapolis Millers | 25 | 11/14/2025 | Levittown | USA | Left | Left | 6' 6" | 200 lbs | $455,000 |
| Ontiveros, Manny | SP | Golden State Admirals | 33 | 09/06/2018 | Santo Domingo | DOM | Right | Right | 6' 6" | 205 lbs | - |
| Oriedo, José | SP | Traverse City Bullet Club | 31 | 02/22/2020 | Santo Domingo | DOM | Right | Right | 6' 4" | 200 lbs | - |
| Orlova, Mike | 1B | Philadelphia Liberty | 23 | 07/18/2028 | Milwaukee | USA | Left | Left | 6' 2" | 200 lbs | $455,000 |
| Ornelas, Juan | RP | San Diego Surf Dawgs | 28 | 04/04/2023 | Pedro Brand | DOM | Left | Right | 6' 2" | 200 lbs | $1,600,000 |
| Orozco, Jorge | SP | Indianapolis Arrows | 34 | 06/13/2017 | San Pedro de Macorís | DOM | Left | Right | 6' 2" | 200 lbs | - |
| Ortega, Pancho | SP | Charlotte Knights | 17 | 04/14/2034 | Atlixco | MEX | Left | Right | 6' 3" | 180 lbs | - |
| Ortíz, Albert | SP | Philadelphia Liberty | 26 | 11/24/2024 | Chihuahua | MEX | Right | Right | 6' 8" | 205 lbs | $455,000 |
| Ortíz, Daniel | SP | Chicago Dogs | 31 | 02/21/2020 | Taxco | MEX | Right | Right | 6' 1" | 185 lbs | $18,200,000 |
| Ortíz, José | SP | Nashville Outlaws | 16 | 02/12/2035 | Valencia | VEN | Left | Left | 6' 0" | 165 lbs | - |
| Ortíz, José | LF | Mahoning Valley Scrappers | 18 | 01/05/2033 | Santo Domingo | DOM | Right | Left | 6' 3" | 185 lbs | - |
| Ottley, Mike | SP | Mahoning Valley Scrappers | 31 | 09/29/2019 | Santa Monica | USA | Right | Right | 6' 2" | 200 lbs | $1,900,000 |
| Ouzts, J.R. | SP | Milwaukee Milkmen | 29 | 12/12/2021 | Los Angeles | USA | Left | Left | 6' 0" | 200 lbs | $12,000,000 |
