| Home | Teams and Players | Homerun Kings | Top Salaries | Most Runs Batted In | Hall of Fame |
| Name | Billy O'Brien |
| Given Name | William Smith |
| Birth Date | 1860-3-14 |
| Birth City | Albany, NY |
| Height | 6'0" |
| Weight | 185 lbs. |
| Batting Hand | Right |
| Pitching Hand | Right |
| Alive | No |
| Age | 51 |
| Year | Team | Hits | At Bats | Home Runs | Runs Batted | Batting Average | Wins | Losses | # of Pitching Games | Strikeouts | # of Shutouts |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 1884 | Kansas City Cowboys | 7 | 30 | 0 | 0 | 0.233333 | 1 | 0 | 2 | 7 | 0 |
| 1884 | Kansas City Cowboys | 4 | 17 | 0 | 0 | 0.235294 | 1 | 0 | 2 | 7 | 0 |
| 1884 | St. Paul White Caps | 7 | 30 | 0 | 0 | 0.233333 | 1 | 0 | 2 | 7 | 0 |
| 1884 | St. Paul White Caps | 4 | 17 | 0 | 0 | 0.235294 | 1 | 0 | 2 | 7 | 0 |
| 1887 | Washington Nationals | 126 | 453 | 19 | 73 | 0.278146 | |||||
| 1888 | Washington Nationals | 119 | 528 | 9 | 66 | 0.225379 | |||||
| 1889 | Washington Nationals | 0 | 8 | 0 | 0 | 0 | |||||
| 1890 | Brooklyn Gladiators | 108 | 388 | 4 | 67 | 0.278351 |
| Year | Position | Errors | Double Plays | Assists |
|---|---|---|---|---|
| 1884 | 1st Base | 0 | 0 | 1 |
| 1884 | 3rd Base | 4 | 0 | 14 |
| 1884 | 3rd Base | 4 | 0 | 9 |
| 1884 | Pitcher | 3 | 1 | 4 |
| 1887 | 1st Base | 32 | 53 | 26 |
| 1887 | 2nd Base | 0 | 0 | 5 |
| 1887 | 3rd Base | 2 | 0 | 5 |
| 1887 | Outfielder | 0 | 0 | 3 |
| 1888 | 1st Base | 33 | 55 | 38 |
| 1888 | 3rd Base | 0 | 0 | 1 |
| 1889 | 1st Base | 0 | 0 | 0 |
| 1890 | 1st Base | 29 | 66 | 35 |