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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| O'Connor, Austin | RP | Brockton Rox | 19 | 11/12/2026 | Anaheim | USA | Right | Right | 6' 4" | 195 lbs | - |
| O'Neal, Josh | RP | Trois-Riveres Aigles | 19 | 02/14/2026 | St. Johns | USA | Right | Right | 6' 2" | 180 lbs | - |
| Oakes, Mike | RP | London Majors | 20 | 07/08/2025 | Brooklyn | USA | Left | Left | 6' 4" | 195 lbs | - |
| Ochoa, Wil | LF | Southern Maryland Blue Crabs | 19 | 03/19/2026 | Santo Domingo | DOM | Right | Right | 6' 0" | 175 lbs | - |
| Okazaki, Mitsuaki | RP | London Majors | 17 | 01/03/2028 | Toyooka | JPN | Right | Right | 6' 7" | 190 lbs | - |
| Olivares, Antonio | 2B | Oakland Oaks | 25 | 06/16/2020 | Xalmimilulco | MEX | Right | Right | 5' 9" | 175 lbs | - |
| Oliver, Mike | SP | Trois-Riveres Aigles | 17 | 04/13/2028 | Rubidoux | USA | Right | Right | 6' 6" | 195 lbs | - |
| Olvera, Hector | RF | Winnipeg Goldeyes | 19 | 04/08/2026 | Santiago de Cuba | CUB | Left | Left | 6' 2" | 175 lbs | - |
| Omori, Toshikatsu | 1B | Trois-Riveres Aigles | 19 | 07/19/2026 | Kitakyushu | JPN | Right | Right | 6' 3" | 190 lbs | - |
| Ortiz, Edgar | 1B | Joplin Blasters | 18 | 04/06/2027 | Guacara | VEN | Left | Right | 6' 4" | 205 lbs | - |
| Ortiz, Ricardo | 1B | Calgary Flames | 20 | 04/23/2025 | Detroit | USA | Right | Right | 6' 1" | 200 lbs | - |
| Ortiz, Victor | RP | London Majors | 17 | 03/06/2028 | Vega Alta | PUR | Right | Right | 6' 4" | 185 lbs | - |
| Ott, Dan | RP | Colorado Avalanche | 22 | 03/02/2023 | Zillah | USA | Switch | Left | 6' 0" | 185 lbs | - |
| Otto, Greg | SP | Houston Colt .45's | 19 | 07/22/2026 | Vista | USA | Right | Right | 5' 10" | 170 lbs | - |
| Oyola, Antonio | LF | Canton Indians | 20 | 07/28/2025 | Mariara | VEN | Right | Right | 6' 3" | 200 lbs | - |
