| Home | Teams and Players | Homerun Kings | Top Salaries | Top RBIs | Hall of Fame |
| First Name | Last Name | Given Name | Birth Year | Birth Month | Birth Day | Birth City | Birth Country | Height | Weight | Age | Bats | Throws |
| Jack | O'Brien | John K. | 1860 | 6 | 12 | Philadelphia | USA | 70 | 184 | 50 | R | R |
| Year | Team | AB | HR | RBI | BA |
|---|---|---|---|---|---|
| 1882 | Philadelphia Athletics | 241 | 3 | 37 | 0.3029 |
| 1883 | Philadelphia Athletics | 390 | 0 | 70 | 0.2897 |
| 1884 | Philadelphia Athletics | 138 | 1 | 0 | 0.2826 |
| 1885 | Philadelphia Athletics | 225 | 2 | 30 | 0.2667 |
| 1886 | Philadelphia Athletics | 423 | 0 | 56 | 0.2530 |
| 1887 | Brooklyn Grays | 123 | 1 | 17 | 0.2276 |
| 1888 | Baltimore Orioles | 196 | 0 | 18 | 0.2245 |
| 1890 | Philadelphia Athletics | 433 | 4 | 80 | 0.2610 |
| Year | Team | W | L | G | SHO |
|---|---|---|---|---|---|
| 1882 | Philadelphia Athletics | 0 | 0 | 0 | 0 |
| 1883 | Philadelphia Athletics | 0 | 0 | 0 | 0 |
| 1884 | Philadelphia Athletics | 0 | 0 | 0 | 0 |
| 1885 | Philadelphia Athletics | 0 | 0 | 0 | 0 |
| 1886 | Philadelphia Athletics | 0 | 0 | 0 | 0 |
| 1887 | Brooklyn Grays | 0 | 0 | 0 | 0 |
| 1888 | Baltimore Orioles | 0 | 0 | 0 | 0 |
| 1890 | Philadelphia Athletics | 0 | 0 | 0 | 0 |
| Year | Team | POS | E | DP | A |
|---|---|---|---|---|---|
| 1882 | Philadelphia Athletics | 1B | 0 | 0 | 0 |
| 1882 | Philadelphia Athletics | 3B | 0 | 0 | 3 |
| 1882 | Philadelphia Athletics | C | 22 | 1 | 66 |
| 1882 | Philadelphia Athletics | OF | 6 | 0 | 12 |
| 1883 | Philadelphia Athletics | 3B | 16 | 3 | 24 |
| 1883 | Philadelphia Athletics | C | 51 | 3 | 58 |
| 1883 | Philadelphia Athletics | OF | 8 | 2 | 6 |
| 1883 | Philadelphia Athletics | SS | 1 | 0 | 1 |
| 1884 | Philadelphia Athletics | 1B | 0 | 1 | 1 |
| 1884 | Philadelphia Athletics | C | 16 | 6 | 43 |
| 1884 | Philadelphia Athletics | OF | 3 | 1 | 1 |
| 1885 | Philadelphia Athletics | 1B | 0 | 4 | 2 |
| 1885 | Philadelphia Athletics | 3B | 0 | 1 | 6 |
| 1885 | Philadelphia Athletics | C | 27 | 3 | 58 |
| 1885 | Philadelphia Athletics | OF | 3 | 0 | 0 |
| 1885 | Philadelphia Athletics | SS | 8 | 2 | 29 |
| 1886 | Philadelphia Athletics | 1B | 12 | 15 | 4 |
| 1886 | Philadelphia Athletics | 2B | 6 | 3 | 18 |
| 1886 | Philadelphia Athletics | 3B | 20 | 3 | 69 |
| 1886 | Philadelphia Athletics | C | 20 | 3 | 52 |
| 1886 | Philadelphia Athletics | OF | 1 | 0 | 1 |
| 1886 | Philadelphia Athletics | SS | 11 | 2 | 26 |
| 1887 | Brooklyn Grays | 2B | 0 | 0 | 2 |
| 1887 | Brooklyn Grays | C | 26 | 4 | 40 |
| 1887 | Brooklyn Grays | OF | 1 | 0 | 0 |
| 1888 | Baltimore Orioles | 1B | 1 | 5 | 0 |
| 1888 | Baltimore Orioles | C | 20 | 4 | 43 |
| 1888 | Baltimore Orioles | OF | 5 | 0 | 0 |
| 1890 | Philadelphia Athletics | 1B | 26 | 61 | 52 |
| 1890 | Philadelphia Athletics | C | 1 | 1 | 2 |
| 1890 | Philadelphia Athletics | OF | 0 | 0 | 0 |