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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| O'Bree, Griff | LF | Wrexham Druids | 34 | 09/06/1870 | Llandrindod Wells | WAL | Right | Right | 1.79 m | 90 kg | - |
| O'Connor, Kayne | 2B | Perth Caber Tossers | 21 | 10/01/1883 | Newtownards | NIR | Left | Right | 1.72 m | 73 kg | - |
| O'Connor, Padraig | 2B | Dublin Vikings | 33 | 05/22/1872 | Dublin | IRL | Right | Right | 1.74 m | 86 kg | - |
| O'Doherty, Francis | RF | Limerick Gandelows | 30 | 01/15/1875 | Derby | ENG | Right | Right | 1.78 m | 91 kg | - |
| O'Doherty, Jonathan | 1B | Birmingham Tradesmen | 28 | 12/03/1876 | London | ENG | Switch | Right | 1.70 m | 88 kg | - |
| O'Gribben, Cillian | LF | Belfast Bards | 34 | 02/03/1871 | Bangor | NIR | Right | Right | 1.68 m | 79 kg | - |
| O'Leary, Duggan | 1B | Belfast Bards | 26 | 11/11/1878 | Lutterworth | ENG | Right | Right | 1.80 m | 82 kg | - |
| O'Mhaille, Colman | LF | Derry Maidens | 32 | 03/30/1873 | Larne | NIR | Right | Right | 1.75 m | 81 kg | - |
| O'Neill, Carlin | LF | Derry Maidens | 32 | 10/18/1872 | Carrickfergus | NIR | Left | Left | 1.83 m | 95 kg | - |
| O'Reilly, Charlie | C | Dublin Vikings | 36 | 10/07/1868 | Southport | ENG | Right | Right | 1.69 m | 87 kg | - |
| O'Reilly, Thomas | SP | Cork Salmon | 33 | 02/21/1872 | Whitefield | ENG | Switch | Right | 1.68 m | 68 kg | - |
| O'Reilly, Tiobrady | 2B | Cork Salmon | 33 | 02/02/1872 | Youghal | IRL | Switch | Right | 1.72 m | 82 kg | - |
| O'Sullivan, Conly | C | Limerick Gandelows | 33 | 09/18/1871 | Dublin | IRL | Left | Right | 1.70 m | 84 kg | - |
| O'Sullivan, Reilly | 3B | Galway Harbourmasters | 31 | 10/14/1873 | Dublin | IRL | Right | Right | 1.79 m | 91 kg | - |
| O'Sullivan, Scanlon | RP | Galway Harbourmasters | 34 | 07/19/1871 | Dungarvan | IRL | Right | Right | 1.74 m | 81 kg | - |
| O'Toole, Leo | RP | Derby Rams | 32 | 03/24/1873 | Lincoln | ENG | Right | Right | 1.65 m | 68 kg | - |
| Ocampo, Hernán | SP | Derry Maidens | 18 | 09/21/1886 | Carolina | PUR | Right | Right | 1.72 m | 66 kg | P930 |
| Ochoa, Aramis | 3B | Coventry Motors | 22 | 01/16/1883 | Mayagüez | PUR | Right | Right | 1.75 m | 76 kg | - |
| Oliva, Avelino | SP | Edinburgh Claymores | 24 | 11/04/1880 | San Juan | PUR | Right | Right | 1.81 m | 83 kg | - |
| Ontiveros, Abundio | 2B | Swansea Copper Lords | 25 | 01/04/1880 | Ponce | PUR | Right | Right | 1.73 m | 86 kg | - |
| Orozco, Gualberto | 2B | Derry Maidens | 22 | 05/12/1883 | Ponce | PUR | Right | Right | 1.75 m | 68 kg | - |
| Ortega, Absalón | SS | Coventry Motors | 27 | 10/14/1877 | Guaynabo | PUR | Right | Right | 1.64 m | 73 kg | - |
| Ortega, Ordoño | SP | Limerick Gandelows | 26 | 01/22/1879 | Orocovis | PUR | Switch | Right | 1.75 m | 79 kg | P780 |
| Ortiz, Luis | SS | Coventry Motors | 22 | 12/09/1882 | Patillas | PUR | Right | Right | 1.82 m | 82 kg | - |
| Ortiz, Zabulón | RP | Derry Maidens | 21 | 04/28/1884 | San Juan | PUR | Left | Right | 1.85 m | 83 kg | - |
| Osorio, Jacinto | RP | Limerick Gandelows | 23 | 05/26/1882 | Mayagüez | PUR | Right | Right | 1.83 m | 83 kg | - |
| Otaño, Tadeo | CF | Glasgow Shipwrights | 20 | 01/30/1885 | San Juan | PUR | Right | Right | 1.77 m | 71 kg | - |
