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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| O'Dwyer, Hegarty | C | St. Gallen Unicorns | 14 | 07/21/2025 | Carrick-on-Shannon | IRL | Right | Right | 6' 1" | 185 lbs | - |
| O'Keeffe, Dempsey | SP | Mönchengladbach Huskies | 15 | 04/22/2025 | Dundalk | IRL | Right | Right | 5' 10" | 150 lbs | - |
| O'Reilly, Cahern | RP | Grenoble Terriers | 18 | 09/15/2021 | Dublin | IRL | Right | Right | 6' 1" | 180 lbs | - |
| Oates, Derek | SP | Dnipro Blue Falcons | 18 | 01/29/2022 | Leominster | ENG | Left | Left | 6' 1" | 170 lbs | - |
| Obrenovic, Bosko | RP | Porto Vandals | 16 | 11/28/2023 | Elena | BUL | Right | Right | 5' 10" | 160 lbs | - |
| Oliver, Sheen | 2B | Dnipro Blue Falcons | 15 | 02/15/2025 | Dublin | IRL | Switch | Right | 6' 3" | 170 lbs | - |
| Ollila, Herkko | RF | Charleroi Osprey | 14 | 05/21/2025 | Budapest | HUN | Left | Left | 6' 3" | 180 lbs | - |
| Ollivier, Laurent | RF | Vigo Golden Knights | 14 | 06/18/2025 | Mourenx | FRA | Left | Right | 6' 4" | 180 lbs | - |
| Olsen, Daniel | SP | Vigo Golden Knights | 16 | 08/11/2023 | Bergen | NOR | Right | Right | 6' 2" | 175 lbs | - |
| Olsen, Magnus | SP | Porto Vandals | 15 | 10/11/2024 | Kristiansand | NOR | Left | Left | 6' 4" | 180 lbs | - |
| Oudshoorn, Chris | RP | Dnipro Blue Falcons | 17 | 02/12/2023 | Oldenzaal | NED | Right | Right | 6' 2" | 170 lbs | - |
| Owens, Dallan | RF | Dundee Mad Dogs | 17 | 06/01/2022 | Letterkenny | IRL | Left | Left | 6' 3" | 185 lbs | - |
