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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| O'Carroll, Edan | SP | London Fog | 24 | 05/28/1891 | Dublin | IRL | Right | Right | 173 cm | 64 kg | - |
| O'Reilly, Rickard | 3B | Derby Rams | 22 | 07/01/1893 | Drogheda | IRL | Right | Right | 177 cm | 78 kg | - |
| O'Shea, Kynan | LF | Swansea Copper Lords | 21 | 02/14/1894 | Dublin | IRL | Left | Right | 175 cm | 72 kg | - |
| O'Sullivan, Fergal | LF | London Fog | 25 | 06/08/1890 | Dublin | IRL | Left | Left | 176 cm | 78 kg | P1,800 |
| O'Sullivan, Malone | SP | Edinburgh Claymores | 24 | 08/08/1891 | Kilkeel | IRL | Left | Left | 178 cm | 85 kg | - |
| O'Sullivan, Ultan | 1B | Coventry Motors | 24 | 06/14/1891 | Ballynahinch | IRL | Right | Right | 180 cm | 87 kg | - |
| Ochoa, Epifanio | CF | London Fog | 23 | 12/04/1892 | Cutral Có | ARG | Left | Right | 183 cm | 84 kg | - |
| Oladeji, Onitunde | SP | London Fog | 23 | 03/22/1892 | Lagos | NGA | Right | Right | 180 cm | 77 kg | - |
| Orozco, Aimar | SP | Swansea Copper Lords | 25 | 10/26/1890 | Ica | PER | Left | Left | 171 cm | 73 kg | - |
| Ortega, Anastasio | C | London Fog | 28 | 05/30/1887 | Cancún | MEX | Right | Right | 177 cm | 75 kg | - |
| Ortega, Jorge | RF | Swansea Copper Lords | 29 | 03/03/1886 | Güines | CUB | Switch | Right | 175 cm | 86 kg | P1,600 |
| Ortiz, Adán | 1B | Edinburgh Claymores | 20 | 06/28/1895 | Reynosa | MEX | Left | Left | 182 cm | 82 kg | - |
| Ortiz, Milcíades | C | Perth Caber Tossers | 24 | 05/18/1891 | San José de Guanipa | VEN | Right | Right | 175 cm | 79 kg | - |
| Ospina, Alfredo | LF | Derby Rams | 25 | 11/06/1890 | El Alto | BOL | Right | Right | 179 cm | 83 kg | - |
| Otero, Abundio | CF | Bangor Bishops | 25 | 11/16/1890 | Arequipa | PER | Right | Right | 187 cm | 90 kg | P1,800 |
| Otero, Esteban | 2B | Cork Salmon | 24 | 08/19/1891 | Cali | COL | Right | Right | 179 cm | 77 kg | - |
| Otero, Luis | RP | Glasgow Shipwrights | 24 | 06/20/1891 | Salto | URU | Left | Left | 180 cm | 84 kg | - |
