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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 |
| Jack | Lapp | John Walker | 1884 | 9 | 10 | Frazer | USA | 68 | 160 | 35 | L | R |
| Year | Team | AB | HR | RBI | BA |
|---|---|---|---|---|---|
| 1908 | Philadelphia Athletics | 35 | 0 | 1 | 0.1429 |
| 1909 | Philadelphia Athletics | 56 | 0 | 10 | 0.3393 |
| 1910 | Philadelphia Athletics | 192 | 0 | 17 | 0.2344 |
| 1911 | Philadelphia Athletics | 167 | 1 | 26 | 0.3533 |
| 1912 | Philadelphia Athletics | 281 | 1 | 35 | 0.2918 |
| 1913 | Philadelphia Athletics | 238 | 1 | 20 | 0.2269 |
| 1914 | Philadelphia Athletics | 199 | 0 | 19 | 0.2312 |
| 1915 | Philadelphia Athletics | 312 | 2 | 31 | 0.2724 |
| 1916 | Chicago White Sox | 101 | 0 | 7 | 0.2079 |
| Year | Team | W | L | G | SHO |
|---|---|---|---|---|---|
| 1908 | Philadelphia Athletics | 0 | 0 | 0 | 0 |
| 1909 | Philadelphia Athletics | 0 | 0 | 0 | 0 |
| 1910 | Philadelphia Athletics | 0 | 0 | 0 | 0 |
| 1911 | Philadelphia Athletics | 0 | 0 | 0 | 0 |
| 1912 | Philadelphia Athletics | 0 | 0 | 0 | 0 |
| 1913 | Philadelphia Athletics | 0 | 0 | 0 | 0 |
| 1914 | Philadelphia Athletics | 0 | 0 | 0 | 0 |
| 1915 | Philadelphia Athletics | 0 | 0 | 0 | 0 |
| 1916 | Chicago White Sox | 0 | 0 | 0 | 0 |
| Year | Team | POS | E | DP | A |
|---|---|---|---|---|---|
| 1908 | Philadelphia Athletics | C | 4 | 0 | 16 |
| 1909 | Philadelphia Athletics | C | 8 | 2 | 26 |
| 1910 | Philadelphia Athletics | C | 9 | 6 | 88 |
| 1911 | Philadelphia Athletics | 1B | 0 | 0 | 4 |
| 1911 | Philadelphia Athletics | C | 9 | 8 | 47 |
| 1912 | Philadelphia Athletics | C | 20 | 10 | 105 |
| 1913 | Philadelphia Athletics | 1B | 0 | 2 | 0 |
| 1913 | Philadelphia Athletics | C | 14 | 3 | 110 |
| 1914 | Philadelphia Athletics | C | 10 | 4 | 88 |
| 1915 | Philadelphia Athletics | 1B | 2 | 0 | 3 |
| 1915 | Philadelphia Athletics | C | 17 | 23 | 115 |
| 1916 | Chicago White Sox | C | 2 | 2 | 41 |