| Years and ERA | Player | League(s) |
|---|
| 1872 (1.98), 1875 (1.52) | |
| 1877 (2.11), 1879 (1.96) | |
| 1880 (0.86), 1885 (1.58), 1888 (1.74) | |
| 1883 (1.84), 1890 (1.54) | |
| 1888 (1.64), 1890 (2.69) | |
| 1892 (1.93), 1901 (1.62) | |
| 1894 (2.78), 1897 (2.54) | |
| 1900 (2.37), 1905 (1.48) | |
| 1904 (1.59), 1908 (1.16) | |
| 1905 (1.28), 1908 (1.43), 1909 (1.14), 1911 (1.99), 1913 (2.06) | |
| 1907 (1.60), 1910 (1.27) | |
| 1912 (1.39) , 1913 (1.14), 1918 (1.27), 1919 (1.49), 1924 (2.72) | |
| 1915 (1.22), 1916 (1.55), 1919 (1.72), 1920 (1.91) | |
| 1921 (2.48), 1922 (2.81) | |
| 1923 (1.93), 1925 (2.63) | |
| 1923 (2.76), 1925 (2.84) | |
| 1924 (2.16), 1928 (2.09), 1930 (2.61) | |
| 1926 (2.61), 1927 (2.47) | |
| 1926 (2.51), 1929 (2.81), 1930 (2.54), 1931 (2.06), 1932 (2.84), 1935 (2.70), 1936 (2.81), 1938 (3.08), 1939 (2.54) | |
| 1929 (3.09), 1931 (2.26) | |
| 1933 (1.66), 1934 (2.30), 1936 (2.31) | |
| | Years and ERA | Player | League(s) |
|---|
| 1934 (2.33), 1937 (2.33) | |
| 1939 (2.29), 1940 (2.48) | |
| 1945 (1.81), 1946 (1.94) | |
| 1947 (2.33), 1953 (2.10), 1961 (3.02) | |
| 1949 (2.36), 1954 (2.64) | |
| 1952 (2.43), 1959 (2.19) | |
| 1956 (2.47), 1958 (2.01) | |
| 1962 (2.54), 1963 (1.88), 1964 (1.74), 1965 (2.04), 1966 (1.73) | |
| 1968 (1.60), 1972 (1.91) | |
| 1970 (2.82), 1971 (1.76), 1973 (2.08) | |
| 1973 (2,40), 1975 (2.09) | |
| 1978 (1.74), 1979 (2.78) | |
| 1981 (1.69), 1987 (2.76) | |
| 1986 (2.48), 1990 (1.93), 1991 (2.62), 1992 (2.41), 1997, (2.05) 1998 (2.65), 2005 (1.87) | |
| 1993 (2.36), 1994 (1.36), 1995 (1.63), 1998 (2.22) | |
| 1996 (1.89), 2000 (2.58) | |
| 1997(1.90), 1999 (2.07), 2000 (1.74), 2002 (2.26), 2003 (2.22) | |
| 1999 (2.48), 2001 (2.49), 2002 (2.32) | |
| 2004 (2.61), 2006 (2.77), 2008 (2.53) | |
| 2004 (2.27), 2007 (2.54) | |
|
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