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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| O'Brien, Keith | RP | Windy City ThunderBolts | 18 | 11/16/2028 | Rowlett | USA | Left | Left | 6' 2" | 180 lbs | - |
| O'Connor, Austin | SP | Brockton Rox | 20 | 11/12/2026 | Anaheim | USA | Right | Right | 6' 4" | 200 lbs | - |
| O'Neal, Josh | RP | Trois-Riveres Aigles | 20 | 02/14/2026 | St. Johns | USA | Right | Right | 6' 2" | 180 lbs | - |
| Oetker, Terry | 1B | Winnipeg Goldeyes | 19 | 04/12/2027 | Euless | USA | Right | Right | 6' 5" | 210 lbs | - |
| Okazaki, Mitsuaki | RP | London Majors | 18 | 01/03/2028 | Toyooka | JPN | Right | Right | 6' 7" | 195 lbs | - |
| Olbera, Carlos | RP | Portland Angels | 19 | 05/17/2027 | Santo Domingo | DOM | Right | Right | 6' 2" | 165 lbs | - |
| Olivares, Antonio | SS | Tijuana Toros | 26 | 06/16/2020 | Xalmimilulco | MEX | Right | Right | 5' 9" | 185 lbs | - |
| Oliver, Mike | SP | Trois-Riveres Aigles | 18 | 04/13/2028 | Rubidoux | USA | Right | Right | 6' 6" | 195 lbs | - |
| Olson, Paul | SP | Oakland Oaks | 17 | 01/06/2029 | Carrollton | USA | Switch | Right | 6' 2" | 190 lbs | - |
| Olvera, Antonio | SP | Canton Indians | 18 | 05/02/2028 | La Joya | MEX | Right | Right | 6' 4" | 185 lbs | - |
| Omori, Toshikatsu | 1B | Trois-Riveres Aigles | 20 | 07/19/2026 | Kitakyushu | JPN | Right | Right | 6' 3" | 195 lbs | - |
| Oram, Dorian | 1B | Canton Indians | 18 | 03/24/2028 | Los Angeles | USA | Left | Left | 6' 3" | 185 lbs | - |
| Ordonez, Juan | CF | Canton Indians | 19 | 05/24/2027 | Santo Domingo | DOM | Right | Right | 6' 3" | 180 lbs | - |
| Orozco, Dan | SS | Paris Cubs | 18 | 05/21/2028 | Hot Springs | USA | Right | Right | 5' 11" | 180 lbs | - |
| Ortiz, Bill | 1B | Canton Indians | 20 | 10/02/2026 | Santo Domingo | DOM | Right | Right | 6' 2" | 195 lbs | - |
| Ortiz, Dave | C | Niagara Falls Phantoms | 18 | 11/23/2028 | Güira de Melena | CUB | Left | Right | 6' 1" | 200 lbs | - |
| Ortiz, Jon | RP | Madison Brewers | 19 | 03/19/2027 | Gatún | PAN | Left | Left | 6' 5" | 200 lbs | - |
| Ortiz, Ricardo | 1B | Calgary Flames | 21 | 04/23/2025 | Detroit | USA | Right | Right | 6' 1" | 200 lbs | - |
| Ortiz, Victor | RP | London Majors | 18 | 03/06/2028 | Vega Alta | PUR | Right | Right | 6' 4" | 185 lbs | - |
| Ott, Dan | SP | Colorado Avalanche | 23 | 03/02/2023 | Zillah | USA | Switch | Left | 6' 0" | 185 lbs | - |
| Oursler, Detlef | 2B | Tijuana Toros | 25 | 08/13/2021 | Oberursel | GER | Switch | Right | 6' 1" | 190 lbs | - |
| Oya, Kunimatsu | SS | Windy City ThunderBolts | 24 | 02/02/2022 | Iwaki | JPN | Right | Right | 6' 0" | 195 lbs | - |
