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| Name | Given Name | Age | Birthday | Height | Weight | Birth City | Birth Country | Batting Hand | Throwing Hand |
|---|---|---|---|---|---|---|---|---|---|
| Jack O'Brien | John Joseph | 60 Deceased | 02/05/1873 | 6'1" | 165 lbs | Watervliet | L | R |
| Year | Team | Games | At Bats | Hits | Home Runs | RBI | Batting AVG | Wins | Losses | Strikeouts | Shutouts | Position | Errors | Double Plays | Assists |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1899 | Washington Senators | 468 | 132 | 6 | 51 | 0.2821 | 3rd Base | 6 | 1 | 10 | |||||
| 1901 | Cleveland Blues | 45 | 8 | 0 | 5 | 0.1778 | Outfield | 23 | 5 | 21 | |||||
| 1901 | Washington Senators | 375 | 106 | 0 | 39 | 0.2827 | Outfield | 2 | 0 | 0 | |||||
| 1903 | Boston Americans | 338 | 71 | 3 | 38 | 0.2101 | 3rd Base | 0 | 0 | 2 |