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| Name | Given Name | Age | Birthday | Height | Weight | Birth City | Birth Country | Batting Hand | Throwing Hand |
|---|---|---|---|---|---|---|---|---|---|
| John O'Brien | John Joseph | 46 Deceased | 07/13/1866 | 6'9" | 175 lbs | St. John | CAN | L | R |
| Year | Team | Games | At Bats | Hits | Home Runs | RBI | Batting AVG | Wins | Losses | Strikeouts | Shutouts | Position | Errors | Double Plays | Assists |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1891 | Brooklyn Grooms | 167 | 41 | 0 | 26 | 0.2455 | 2nd Base | 32 | 13 | 102 | |||||
| 1893 | Chicago Colts | 14 | 5 | 0 | 1 | 0.3571 | 2nd Base | 2 | 1 | 8 | |||||
| 1895 | Louisville Colonels | 539 | 138 | 1 | 50 | 0.2560 | 1st Base | 1 | 2 | 1 | |||||
| 1896 | Louisville Colonels | 186 | 63 | 2 | 24 | 0.3387 | 2nd Base | 46 | 56 | 396 | |||||
| 1896 | Washington Senators | 270 | 72 | 4 | 33 | 0.2667 | 2nd Base | 24 | 19 | 147 | |||||
| 1897 | Washington Senators | 320 | 78 | 3 | 45 | 0.2438 | 2nd Base | 20 | 33 | 228 | |||||
| 1899 | Baltimore Orioles | 135 | 26 | 1 | 17 | 0.1926 | 2nd Base | 30 | 43 | 260 | |||||
| 1899 | Pittsburgh Pirates | 279 | 63 | 1 | 33 | 0.2258 | 2nd Base | 8 | 21 | 132 |