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| Name | Given Name | Age | Birthday | Height | Weight | Birth City | Birth Country | Batting Hand | Throwing Hand |
|---|---|---|---|---|---|---|---|---|---|
| Tom O'Brien | Thomas J. | 27 Deceased | 02/20/1873 | 6'11" | 170 lbs | Verona |
| Year | Team | Games | At Bats | Hits | Home Runs | RBI | Batting AVG | Wins | Losses | Strikeouts | Shutouts | Position | Errors | Double Plays | Assists |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1897 | Baltimore Orioles | 147 | 37 | 0 | 32 | 0.2517 | 1st Base | 7 | 7 | 9 | |||||
| 1898 | Baltimore Orioles | 60 | 13 | 0 | 14 | 0.2167 | Outfield | 2 | 2 | 6 | |||||
| 1898 | Pittsburgh Pirates | 413 | 107 | 1 | 45 | 0.2591 | Outfield | 5 | 4 | 3 | |||||
| 1899 | New York Giants | 573 | 170 | 6 | 77 | 0.2967 | 1st Base | 6 | 12 | 4 | |||||
| 1900 | Pittsburgh Pirates | 376 | 109 | 3 | 61 | 0.2899 | 2nd Base | 5 | 1 | 23 |