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| Name | Given Name | Age | Birthday | Height | Weight | Birth City | Birth Country | Batting Hand | Throwing Hand |
|---|---|---|---|---|---|---|---|---|---|
| Tom O'Brien | Thomas H. | 60 Deceased | 06/22/1860 | 6'1" | 185 lbs | Salem | R | R |
| Year | Team | Games | At Bats | Hits | Home Runs | RBI | Batting AVG | Wins | Losses | Strikeouts | Shutouts | Position | Errors | Double Plays | Assists |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1882 | Worcester Ruby Legs | 1 | 89 | 18 | 0 | 7 | 0.2022 | 0 | 0 | 0 | 0 | 2nd Base | 3 | 2 | 5 |
| 1883 | Baltimore Orioles | 138 | 37 | 0 | 0 | 0.2681 | 3rd Base | 2 | 0 | 0 | |||||
| 1884 | Boston Reds | 449 | 118 | 4 | 0 | 0.2628 | Outfield | 12 | 0 | 4 | |||||
| 1885 | Baltimore Orioles | 33 | 7 | 0 | 5 | 0.2121 | 2nd Base | 36 | 8 | 93 | |||||
| 1887 | New York Metropolitans | 129 | 25 | 0 | 18 | 0.1938 | Outfield | 0 | 0 | 0 | |||||
| 1890 | Rochester Broncos | 273 | 52 | 0 | 31 | 0.1905 | 1st Base | 0 | 0 | 0 |