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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| O'Dea, Matt | 1B | Baltimore (APP) Orioles | 22 | 12/30/2023 | East Bethel | USA | Right | Right | 6' 3" | 200 lbs | - |
| O'Neal, Justin | 2B | Pulaski Yankees | 19 | 12/05/2026 | Murfreesboro | USA | Left | Right | 6' 6" | 200 lbs | - |
| Oake, Ed | 3B | San Diego (APP) Padres | 21 | 06/19/2024 | Laval | CAN | Right | Right | 6' 2" | 195 lbs | - |
| Olivares, C.J. | LF | Helena Brewers | 20 | 01/22/2025 | Brooklyn | USA | Switch | Right | 6' 2" | 190 lbs | - |
| Oliynyk, Matviy | 3B | Grand Junction Rockies | 20 | 04/23/2025 | Lutsk | UKR | Right | Right | 6' 8" | 230 lbs | - |
| Onorati, J.D. | 1B | Great Falls Voyagers | 25 | 06/22/2020 | Dallas | USA | Left | Right | 6' 5" | 200 lbs | - |
| Ontiveros, Jose | CF | Bluefield Blue Jays | 23 | 08/29/2022 | San Pedro de Macorís | DOM | Right | Right | 6' 2" | 200 lbs | - |
| Ortez, Emilio | 1B | Philadelphia (APP) Phillies | 22 | 10/29/2023 | Coro | VEN | Left | Left | 6' 1" | 200 lbs | - |
| Ortiz, Albert | C | Texas (APP) Rangers | 20 | 03/02/2025 | Poteet | USA | Switch | Right | 6' 4" | 200 lbs | - |
| Ortiz, Jon | SP | Helena Brewers | 18 | 03/19/2027 | Gatún | PAN | Left | Left | 6' 4" | 200 lbs | - |
| Osorio, Travis | SP | Missoula Osprey | 19 | 01/19/2026 | Laurence Harbor | USA | Left | Left | 6' 2" | 180 lbs | - |
| Osting, Chris | LF | Grand Junction Rockies | 21 | 08/14/2024 | North Creek | USA | Right | Right | 6' 2" | 200 lbs | - |
| Ostrowski, Cy | 1B | Oakland (APP) Athletics | 25 | 12/08/2020 | Elkhart | USA | Left | Left | 6' 2" | 200 lbs | - |
| Ott, Butch | SP | Burlington Royals | 20 | 05/20/2025 | Suffolk | USA | Left | Left | 6' 4" | 200 lbs | - |
