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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| O'Neil, Hugh | CL | El Paso Finos | 34 | 05/05/1854 | Brooklyn | USA | Right | Right | 178 cm | 79 kg | P280 |
| O'Neill, Beau | 2B | Amarillo Horizons | 20 | 10/28/1867 | Corpus Christi | USA | Right | Right | 181 cm | 81 kg | - |
| O'Neill, Tip | LF | Luling Lavender Stockings | 30 | 05/25/1858 | Springfield | CAN | Right | Right | 185 cm | 78 kg | P813 |
| O'Sullivan, Keely | 3B | Waco Mammoths | 36 | 11/07/1851 | El Paso | USA | Right | Right | 176 cm | 92 kg | P280 |
| Ocampo, Leónidas | 3B | San Angelo Killer Cacti | 20 | 06/23/1868 | San Juan | PUR | Right | Right | 171 cm | 68 kg | - |
| Ochoa, Normando | CF | El Paso Finos | 24 | 02/12/1864 | Ponce | PUR | Right | Right | 173 cm | 78 kg | P273 |
| Odom, Khalil | RF | El Paso Finos | 23 | 12/20/1864 | Clinton | USA | Right | Left | 176 cm | 83 kg | P260 |
| Oliveros, Rigoberto | C | Tyler Pecan Kings | 21 | 12/18/1866 | Ponce | PUR | Left | Right | 176 cm | 81 kg | P240 |
| Olson, Justin | SP | Beaumont Alpinists | 29 | 02/02/1859 | Missouri City | USA | Right | Right | 174 cm | 76 kg | P380 |
| Olvera, Fulgencio | SS | Beaumont Alpinists | 22 | 10/24/1865 | Gurabo | PUR | Right | Right | 169 cm | 67 kg | P240 |
| Ontiveros, Absalón | SP | San Marcos Cadavers | 19 | 11/03/1868 | San Juan | PUR | Right | Right | 179 cm | 69 kg | P250 |
| Ortiz, Alejo | 1B | Odessa Cowhands | 22 | 10/17/1865 | Corozal | PUR | Left | Left | 174 cm | 89 kg | P420 |
| Ortiz, Ciro | LF | Galveston Gulls | 31 | 06/03/1857 | Orocovis | PUR | Right | Right | 173 cm | 82 kg | P310 |
| Ortiz, Guiomar | 2B | Odessa Cowhands | 28 | 09/22/1859 | Vega Baja | PUR | Switch | Right | 168 cm | 79 kg | P410 |
| Ortiz, Ignacio | C | Abilene Preachers | 27 | 10/01/1860 | Carolina | PUR | Right | Right | 175 cm | 88 kg | P260 |
| Ortiz, Mamerto | RF | Galveston Gulls | 19 | 12/16/1868 | Bayamón | PUR | Right | Right | 176 cm | 81 kg | - |
| Ortiz, Martín | C | Lubbock Layabouts | 28 | 05/10/1860 | Bayamón | PUR | Right | Right | 171 cm | 84 kg | P270 |
| Ortiz, Zacarías | RF | Lubbock Layabouts | 23 | 12/20/1864 | San Juan | PUR | Right | Left | 174 cm | 78 kg | P360 |
| Osorio, Juan | 3B | Tyler Pecan Kings | 29 | 02/04/1859 | Trujillo Alto | PUR | Right | Right | 172 cm | 81 kg | P660 |
| Owen, Joshua | CF | Amarillo Horizons | 16 | 10/09/1871 | Nassau | BAH | Switch | Right | 179 cm | 71 kg | - |
| Owen, Paul | SS | Marfa Ghost Lights | 25 | 01/15/1863 | Austin | USA | Right | Right | 179 cm | 87 kg | P260 |
