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| First Name | Last Name | Given Name | Birth Year | Birth Month | Birth Day | Birth City | Birth Country | Height | Weight | Age | Bats | Throws |
| Denny | Mack | Dennis Joseph | 1850 | 3 | 14 | Mauch Chunk | USA | 67 | 164 | 38 | R | R |
| Year | Team | AB | HR | RBI | BA |
|---|---|---|---|---|---|
| 1871 | Rockford Forest Citys | 122 | 0 | 17 | 0.2459 |
| 1872 | Philadelphia Athletics | 205 | 0 | 34 | 0.2878 |
| 1873 | Philadelphia Whites | 205 | 0 | 20 | 0.2927 |
| 1874 | Philadelphia Whites | 246 | 0 | 22 | 0.2073 |
| 1876 | St. Louis Brown Stockings | 180 | 1 | 7 | 0.2167 |
| 1880 | Buffalo Bisons | 59 | 0 | 3 | 0.2034 |
| 1882 | Louisville Eclipse | 264 | 0 | 0 | 0.1818 |
| 1883 | Pittsburg Alleghenys | 224 | 0 | 0 | 0.1964 |
| Year | Team | W | L | G | SHO |
|---|---|---|---|---|---|
| 1871 | Rockford Forest Citys | 0 | 1 | 3 | 0 |
| 1872 | Philadelphia Athletics | 0 | 0 | 0 | 0 |
| 1873 | Philadelphia Whites | 0 | 0 | 0 | 0 |
| 1874 | Philadelphia Whites | 0 | 0 | 0 | 0 |
| 1876 | St. Louis Brown Stockings | 0 | 0 | 0 | 0 |
| 1880 | Buffalo Bisons | 0 | 0 | 0 | 0 |
| 1882 | Louisville Eclipse | 0 | 0 | 0 | 0 |
| 1883 | Pittsburg Alleghenys | 0 | 0 | 0 | 0 |
| Year | Team | POS | E | DP | A |
|---|---|---|---|---|---|
| 1871 | Rockford Forest Citys | 1B | 19 | 11 | 6 |
| 1871 | Rockford Forest Citys | OF | 0 | 0 | 0 |
| 1871 | Rockford Forest Citys | P | 0 | 0 | 2 |
| 1871 | Rockford Forest Citys | SS | 1 | 0 | 2 |
| 1872 | Philadelphia Athletics | 1B | 16 | 8 | 11 |
| 1872 | Philadelphia Athletics | SS | 25 | 0 | 56 |
| 1873 | Philadelphia Whites | 1B | 30 | 20 | 8 |
| 1873 | Philadelphia Whites | 2B | 0 | 0 | 2 |
| 1873 | Philadelphia Whites | OF | 1 | 0 | 1 |
| 1873 | Philadelphia Whites | SS | 2 | 0 | 12 |
| 1874 | Philadelphia Whites | 1B | 55 | 31 | 8 |
| 1876 | St. Louis Brown Stockings | 2B | 4 | 2 | 10 |
| 1876 | St. Louis Brown Stockings | OF | 2 | 0 | 0 |
| 1876 | St. Louis Brown Stockings | SS | 20 | 6 | 114 |
| 1880 | Buffalo Bisons | 2B | 0 | 0 | 1 |
| 1880 | Buffalo Bisons | SS | 4 | 3 | 45 |
| 1882 | Louisville Eclipse | 2B | 25 | 11 | 59 |
| 1882 | Louisville Eclipse | OF | 0 | 0 | 0 |
| 1882 | Louisville Eclipse | SS | 24 | 9 | 161 |
| 1883 | Pittsburg Alleghenys | 1B | 9 | 11 | 10 |
| 1883 | Pittsburg Alleghenys | 2B | 0 | 0 | 7 |
| 1883 | Pittsburg Alleghenys | SS | 25 | 7 | 106 |