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| Name | Given Name | Age | Birthday | Height | Weight | Birth City | Birth Country | Batting Hand | Throwing Hand |
|---|---|---|---|---|---|---|---|---|---|
| Billy O'Brien | William Smith | 51 Deceased | 03/14/1860 | 6'0" | 185 lbs | Albany | R | R |
| Year | Team | Games | At Bats | Hits | Home Runs | RBI | Batting AVG | Wins | Losses | Strikeouts | Shutouts | Position | Errors | Double Plays | Assists |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1884 | Kansas City Cowboys | 2 | 30 | 7 | 0 | 0 | 0.2333 | 1 | 0 | 7 | 0 | 3rd Base | 4 | 0 | 14 |
| 1884 | St. Paul White Caps | 17 | 4 | 0 | 0 | 0.2353 | Pitcher | 3 | 1 | 4 | |||||
| 1887 | Washington Nationals | 453 | 126 | 19 | 73 | 0.2781 | 1st Base | 0 | 0 | 1 | |||||
| 1888 | Washington Nationals | 528 | 119 | 9 | 66 | 0.2254 | 3rd Base | 4 | 0 | 9 | |||||
| 1889 | Washington Nationals | 8 | 0 | 0 | 0 | 0.0000 | 1st Base | 32 | 53 | 26 | |||||
| 1890 | Brooklyn Gladiators | 388 | 108 | 4 | 67 | 0.2784 | 2nd Base | 0 | 0 | 5 |