Winning Percentage: American League
Updated July 13, 2018 |
Infoplease Staff
American League
Multiple winners: Lefty Grove (5); Chief Bender, Roger Clemens and Whitey Ford (3); Johnny Allen, Eddie Cicotte, Mike Cuellar, Lefty Gomez, Ron Guidry, Catfish Hunter, Randy Johnson, Walter Johnson, Pedro Martinez, Jim Palmer, Pete Vuckovich and Smokey Joe Wood (2).
| Year | W-L | Pct | |
|---|---|---|---|
| 1901 | Clark Griffith, Chicago | 24-7 | .774 |
| 1902 | Bill Bernhard, Phila-Cleve | 18-5 | .783 |
| 1903 | Cy Young, Boston | 28-9 | .757 |
| 1904 | Jack Chesbro, New York | 41-12 | .774 |
| 1905 | Andy Coakley, Philadelphia | 20-7 | .741 |
| 1906 | Eddie Plank, Philadelphia | 19-6 | .760 |
| 1907 | Wild Bill Donovan, Detroit | 25-4 | .862 |
| 1908 | Ed Walsh, Chicago | 40-15 | .727 |
| 1909 | George Mullin, Detroit | 29-8 | .784 |
| 1910 | Chief Bender, Philadelphia | 23-5 | .821 |
| 1911 | Chief Bender, Philadelphia | 17-5 | .773 |
| 1912 | Smokey Joe Wood, Boston | 34-5 | .872 |
| 1913 | Walter Johnson, Washington | 36-7 | .837 |
| 1914 | Chief Bender, Philadelphia | 17-3 | .850 |
| 1915 | Smokey Joe Wood, Boston | 15-5 | .750 |
| 1916 | Eddie Cicotte, Chicago | 15-7 | .682 |
| 1917 | Reb Russell, Chicago | 15-5 | .750 |
| 1918 | Sad Sam Jones, Boston | 16-5 | .762 |
| 1919 | Eddie Cicotte, Chicago | 29-7 | .806 |
| 1920 | Jim Bagby, Cleveland | 31-12 | .721 |
| 1921 | Carl Mays, New York | 27-9 | .750 |
| 1922 | Joe Bush, New York | 26-7 | .788 |
| 1923 | Herb Pennock, New York | 19-6 | .760 |
| 1924 | Walter Johnson, Washington | 23-7 | .767 |
| 1925 | Stan Coveleski, Washington | 20-5 | .800 |
| 1926 | George Uhle, Cleveland | 27-11 | .711 |
| 1927 | Waite Hoyt, New York | 22-7 | .759 |
| 1928 | General Crowder, St. Louis | 21-5 | .808 |
| 1929 | Lefty Grove, Philadelphia | 20-6 | .769 |
| 1930 | Lefty Grove, Philadelphia | 28-5 | .848 |
| 1931 | Lefty Grove, Philadelphia | 31-4 | .886 |
| 1932 | Johnny Allen, New York | 17-4 | .810 |
| 1933 | Lefty Grove, Philadelphia | 24-8 | .750 |
| 1934 | Lefty Gomez, New York | 26-5 | .839 |
| 1935 | Eldon Auker, Detroit | 18-7 | .720 |
| 1936 | Monte Pearson, New York | 19-7 | .731 |
| 1937 | Johnny Allen, Cleveland | 15-1 | .938 |
| 1938 | Red Ruffing, New York | 21-7 | .750 |
| 1939 | Lefty Grove, Boston | 15-4 | .789 |
| 1940 | Schoolboy Rowe, Detroit | 16-3 | .842 |
| 1941 | Lefty Gomez, New York | 15-5 | .750 |
| 1942 | Ernie Bonham, New York | 21-5 | .808 |
| 1943 | Spud Chandler, New York | 20-4 | .833 |
| 1944 | Tex Hughson, Boston | 18-5 | .783 |
| 1945 | Hal Newhouser, Detroit | 25-9 | .735 |
| 1946 | Boo Ferriss, Boston | 25-6 | .806 |
| 1947 | Allie Reynolds, New York | 19-8 | .704 |
| 1948 | Jack Kramer, Boston | 18-5 | .783 |
| 1949 | Ellis Kinder, Boston | 23-6 | .793 |
| 1950 | Vic Raschi, New York | 21-8 | .724 |
| 1951 | Bob Feller, Cleveland | 22-8 | .733 |
| 1952 | Bobby Shantz, Philadelphia | 24-7 | .774 |
| 1953 | Ed Lopat, New York | 16-4 | .800 |
| 1954 | Sandy Consuegra, Chicago | 16-3 | .842 |
| 1955 | Tommy Byrne, New York | 16-5 | .762 |
| 1956 | Whitey Ford, New York | 19-6 | .760 |
| 1957 | Dick Donovan, Chicago | 16-6 | .727 |
| & Tom Sturdivant, New York | 16-6 | .727 | |
| 1958 | Bob Turley, New York | 21-7 | .750 |
| 1959 | Bob Shaw, Chicago | 18-6 | .750 |
| 1960 | Jim Perry, Cleveland | 18-10 | .643 |
| 1961 | Whitey Ford, New York | 25-4 | .862 |
| 1962 | Ray Herbert, Chicago | 20-9 | .690 |
| 1963 | Whitey Ford, New York | 24-7 | .774 |
| 1964 | Wally Bunker, Baltimore | 19-5 | .792 |
| 1965 | Mudcat Grant, Minnesota | 21-7 | .750 |
| 1966 | Sonny Siebert, Cleveland | 16-8 | .667 |
| 1967 | Joe Horlen, Chicago | 19-7 | .731 |
| 1968 | Denny McLain, Detroit | 31-6 | .838 |
| 1969 | Jim Palmer, Baltimore | 16-4 | .800 |
| 1970 | Mike Cuellar, Baltimore | 24-8 | .750 |
| 1971 | Dave McNally, Baltimore | 21-5 | .808 |
| 1972 | Catfish Hunter, Oakland | 21-7 | .750 |
| 1973 | Catfish Hunter, Oakland | 21-5 | .808 |
| 1974 | Mike Cuellar, Baltimore | 22-10 | .688 |
| 1975 | Mike Torrez, Baltimore | 20-9 | .690 |
| 1976 | Bill Campbell, Minnesota | 17-5 | .773 |
| 1977 | Paul Splittorff, Kansas City | 16-6 | .727 |
| 1978 | Ron Guidry, New York | 25-3 | .893 |
| 1979 | Mike Caldwell, Milwaukee | 16-6 | .727 |
| 1980 | Steve Stone, Baltimore | 25-7 | .781 |
| 1981 | Pete Vuckovich, Milwaukee | 14-4 | .778 |
| 1982 | Pete Vuckovich, Milwaukee | 18-6 | .750 |
| & Jim Palmer, Baltimore | 15-5 | .750 | |
| 1983 | Rich Dotson, Chicago | 22-7 | .759 |
| 1984 | Doyle Alexander, Toronto | 17-6 | .739 |
| 1985 | Ron Guidry, New York | 22-6 | .786 |
| 1986 | Roger Clemens, Boston | 24-4 | .857 |
| 1987 | Roger Clemens, Boston | 20-9 | .690 |
| 1988 | Frank Viola, Minnesota | 24-7 | .774 |
| 1989 | Bret Saberhagen, Kansas City | 23-6 | .793 |
| 1990 | Bob Welch, Oakland | 27-6 | .818 |
| 1991 | Scott Erickson, Minnesota | 20-8 | .714 |
| 1992 | Mike Mussina, Baltimore | 18-5 | .783 |
| 1993 | Jimmy Key, New York | 18-6 | .750 |
| 1994 | Jason Bere, Chicago | 12-2 | .857 |
| 1995 | Randy Johnson, Seattle | 18-2 | .900 |
| 1996 | Charles Nagy, Cleveland | 17-5 | .773 |
| 1997 | Randy Johnson, Seattle | 20-4 | .833 |
| 1998 | David Wells, New York | 18-4 | .818 |
| 1999 | Pedro Martinez, Boston | 23-4 | .852 |
| 2000 | Tim Hudson, Oakland | 20-6 | .769 |
| 2001 | Roger Clemens, New York | 20-3 | .870 |
| 2002 | Pedro Martinez, Boston | 20-4 | .833 |
| 2003 | Roy Halladay, Toronto | 22-7 | .759 |
| 2004 | Curt Schilling, Boston | 21-6 | .778 |
| National League | Winning Percentage |
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