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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| O'Flaherty, Caspar | RP | Concord Blue Devils | 20 | 10/08/2027 | Adelaide | AUS | Right | Right | 6' 5" | 200 lbs | - |
| O'Meara, Dan | SP | Da Nang Dolphins | 20 | 08/07/2027 | Paoli | USA | Right | Right | 6' 6" | 200 lbs | - |
| O'Sullivan, Chris | RP | Charleston Chews | 26 | 02/19/2022 | Blue Ridge | USA | Right | Right | 6' 6" | 200 lbs | - |
| O'Sullivan, Ferris | CF | Charleston Chews | 21 | 11/10/2026 | Limerick | IRL | Right | Right | 5' 11" | 165 lbs | - |
| Ogaz, Edgar | RP | Great Lakes Loons | 20 | 08/19/2027 | Valencia | VEN | Switch | Right | 6' 6" | 200 lbs | - |
| Ojeda, Raul | CF | Tulsa Drillers | 22 | 11/13/2025 | Barquisimeto | VEN | Right | Left | 6' 3" | 200 lbs | - |
| Oliva, Juan | SP | Arlington Trappers | 19 | 01/25/2029 | Santo Domingo | DOM | Right | Left | 6' 2" | 175 lbs | - |
| Olmos, Willie | SS | Traverse City Cherries | 21 | 09/18/2026 | Hato Mayor | DOM | Right | Right | 5' 11" | 180 lbs | - |
| Orona, Melvin | SP | Free Agent | 20 | 12/19/2027 | Valencia | VEN | Right | Right | 6' 5" | 195 lbs | - |
| Ortega, Frank | SP | Charleston Chews | 20 | 03/16/2028 | New Orleans | USA | Right | Right | 6' 4" | 180 lbs | - |
| Ortega, Girard | CF | Great Lakes Loons | 22 | 11/01/2025 | Ciudad Bolívar | VEN | Right | Right | 6' 0" | 190 lbs | - |
| Ortiz, Luis | SP | Charleston Chews | 22 | 05/24/2026 | Duvergé | DOM | Left | Right | 6' 2" | 185 lbs | - |
