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| First Name | Last Name | Given Name | Birth Year | Birth Month | Birth Day | Birth City | Birth Country | Height | Weight | Age | Bats | Throws |
| Jack | O'Neill | John Joseph | 1873 | 1 | 10 | Galway | Ireland | 70 | 165 | 62 | R | R |
| Year | Team | AB | HR | RBI | BA |
|---|---|---|---|---|---|
| 1902 | St. Louis Cardinals | 192 | 0 | 12 | 0.1406 |
| 1903 | St. Louis Cardinals | 246 | 0 | 27 | 0.2358 |
| 1904 | Chicago Cubs | 168 | 1 | 19 | 0.2143 |
| 1905 | Chicago Cubs | 172 | 0 | 12 | 0.1977 |
| 1906 | Boston Beaneaters | 167 | 0 | 4 | 0.1796 |
| Year | Team | W | L | G | SHO |
|---|---|---|---|---|---|
| 1902 | St. Louis Cardinals | 0 | 0 | 0 | 0 |
| 1903 | St. Louis Cardinals | 0 | 0 | 0 | 0 |
| 1904 | Chicago Cubs | 0 | 0 | 0 | 0 |
| 1905 | Chicago Cubs | 0 | 0 | 0 | 0 |
| 1906 | Boston Beaneaters | 0 | 0 | 0 | 0 |