. Il s'agit de la troisième plus vieille compétition en activité de l'histoire du golf après l'Open britannique (1860) et l'
(1895). En début d'année 2007, le tournoi est renommé en
. Ce tournoi n'est pas ouvert aux amateurs.
| Année | Parcours | Vainqueur | Nouvelle appellation de la compétition |
|---|
| 1899 | Glen View Club | Willie Smith | Western Open |
| 1900 | annulé | | |
| 1901 | Midlothian Country Club | Laurie Auchterlonie | |
| 1902 | Euclid Club | Willie Anderson | |
| 1903 | Milwaukee Country Club | Alex Smith | |
| 1904 | Kent Country Club | Willie Anderson | |
| 1905 | Cincinnati Golf Club | Arthur Smith | |
| 1906 | Homewood Country Club | Alex Smith | |
| 1907 | Hinsdale Golf Club | Robert Simpson | |
| 1908 | Normandie Golf Club | Willie Anderson | |
| 1909 | Skokie Country Club | Willie Anderson | |
| 1910 | Beverly Country Club | Chick Evans | |
| 1911 | Kent Country Club | Robert Simpson | |
| 1912 | Idlewild Country Club | Macdonald Smith | |
| 1913 | Memphis Country Club | John McDermott | |
| 1914 | Interlachen Country Club | Jim Barnes | |
| 1915 | Glen Oak Golf Club | Tom McNamara | |
| 1916 | Blue Mound Golf & Country Club | Walter Hagen | |
| 1917 | Westmoreland Country Club | Jim Barnes | |
| 1918 | annulé | | |
| 1919 | Mayfield Country Club | Jim Barnes | |
| 1920 | Olympia Fields Country Club | Jock Hutchison | |
| 1921 | Oakwood Club | Walter Hagen | |
| 1922 | Oakland Hills Country Club | Mike Brady | |
| 1923 | Colonial Country Club | Jock Hutchison | |
| 1924 | Calumet Country Club | Bill Mehlhorn | |
| 1925 | Youngstown Country Club | Macdonald Smith | |
| 1926 | Highland Golf & Country Club | Walter Hagen | |
| 1927 | Olympia Fields Country Club | Walter Hagen | |
| 1928 | North Shore Country Club | Abe Espinosa | |
| 1929 | Ozaukee Country Club | Tommy Armour | |
| 1930 | Indianwood Golf & Country Club | Gene Sarazen | |
| 1931 | Miami Valley Golf Club | Ed Dudley | |
| 1932 | Canterbury Golf Club | Walter Hagen | |
| 1933 | Olympia Fields Country Club | Macdonald Smith | |
| 1934 | Country Club of Peoria | Harry Cooper | |
| 1935 | South Bend Country Club | Johnny Revolta | |
| 1936 | Davenport Country Club | Ralph Guldahl | |
| 1937 | Canterbury Golf Club | Ralph Guldahl | |
| 1938 | Westwood Country Club | Ralph Guldahl | |
| 1939 | Medinah Country Course | Byron Nelson | |
| 1940 | River Oaks Country Club | Jimmy Demaret | |
| 1941 | Phoenix Golf Club | Ed Oliver | |
| 1942 | Phoenix Golf Club | Herman Barron | |
| 1943 | annulée | | |
| 1944 | annulée | | |
| 1945 | annulée | | |
| 1946 | Sunset Country Club | Ben Hogan | |
| 1947 | Salt Lake City Country Club | Johnny Palmer | |
| 1948 | Brookfield Country Club | Ben Hogan | |
| 1949 | Keller Golf Course | Sam Snead | |
| 1950 | Brentwood Country Club | Sam Snead | |
| 1951 | Davenport Country Club | Marty Furgol | |
| 1952 | Westwood Country Club | Lloyd Mangrum | |
| 1953 | Bellerive Country Club | E. J. Harrison | |
| 1954 | Kenwood Country Club | LLoyd Mangrum | |
| 1955 | Portland Golf Club | Cary Middlecoff | |
| 1956 | Presidio Golf Club | Mike Fetchick | |
| 1957 | Plum Hollow Country Club | Doug Ford | |
| 1958 | Red Run Golf Club | Doug Sanders | |
| 1959 | Pittsburgh Field Club | Mike Souchak | |
| 1960 | Western Golf & Country Club | Stan Leonard | |
| 1961 | Blythefield Country Club | Arnold Palmer | |
| 1962 | Medinah Country Club | Jacky Cupit | |
| 1963 | Beverly Country Club | Arnold Palmer | |
| 1964 | Tam O’Shanter Country Club | Chi Chi Rodriguez | |
| 1965 | Tam O’Shanter Country Club | Billy Casper | |
| 1966 | Medinah Country Club | Billy Casper | |
| 1967 | Beverly Country Club | Jack Nicklaus | |
| 1968 | Olympia Fields Country Club | Jack Nicklaus | |
| 1969 | Midlothian Country Club | Billy Casper | |
| 1970 | Beverly Country Club | Hugh Royer, Jr. | |
| 1971 | Olympia Fields Country Club | Bruce Crampton | |
| 1972 | Sunset Ridge Country Club | Jim Jamieson | |
| 1973 | Midlothian Country Club | Billy Casper | |
| 1974 | Butler National Golf Club | Tom Watson | |
| 1975 | Butler National Golf Club | Hale Irwin | |
| 1976 | Butler National Golf Club | Al Geiberger | |
| 1977 | Butler National Golf Club | Larry Nelson | |
| 1978 | Butler National Golf Club | Andy Bean | |
| 1979 | Butler National Golf Club | Larry Nelson | |
| 1980 | Butler National Golf Club | Scott Simpson | |
| 1981 | Butler National Golf Club | Ed Fiori | |
| 1982 | Butler National Golf Club | Tom Weiskopf | |
| 1983 | Butler National Golf Club | Mark McCumber | |
| 1984 | Butler National Golf Club | Tom Watson | |
| 1985 | Butler National Golf Club | Scott Verplank | |
| 1986 | Butler National Golf Club | Tom Kite | |
| 1987 | Butler National Golf Club | D.A. Weibring | Beatrice Western Open |
| 1988 | Butler National Golf Club | Jim Benepe | |
| 1989 | Butler National Golf Club | Mark McCumber | |
| 1990 | Butler National Golf Club | Wayne Levi | Centel Western Open |
| 1991 | Cog Hill Golf & Country Club | Russ Cochran | |
| 1992 | Cog Hill Golf & Country Club | Ben Crenshaw | |
| 1993 | Cog Hill Golf & Country Club | Nick Price | Sprint Western Open |
| 1994 | Cog Hill Golf & Country Club | Nick Price | Motorola Western Open |
| 1995 | Cog Hill Golf & Country Club | Billy Mayfair | |
| 1996 | Cog Hill Golf & Country Club | Steve Stricker | |
| 1997 | Cog Hill Golf & Country Club | Tiger Woods | |
| 1998 | Cog Hill Golf & Country Club | Joe Durant | |
| 1999 | Cog Hill Golf & Country Club | Tiger Woods | |
| 2000 | Cog Hill Golf & Country Club | Robert Allenby | Advil Western Open |
| 2001 | Cog Hill Golf & Country Club | Scott Hoch | |
| 2002 | Cog Hill Golf & Country Club | Jerry Kelly | |
| 2003 | Cog Hill Golf & Country Club | Tiger Woods | 100th Western Open presented by Golf Digest |
| 2004 | Cog Hill Golf & Country Club | Stephen Ames | Cialis Western Open |
| 2005 | Cog Hill Golf & Country Club | Jim Furyk | |
| 2006 | Cog Hill Golf & Country Club | Trevor Immelman | |
| 2007 | Cog Hill Golf & Country Club | Tiger Woods | Championnat BMW |