The two team statistics I examine most closely to determine long term success are OPS and ERA. Teams that are amongst the top-10 in each of these categories tend to always play meaningful baseball in September and October, while teams that struggle in one or both are typically sellers in late July. Win-loss records and run differentials certainly are the ultimate indicator of true success, but they can be flukish and over time the OPS and ERA should fall in line with the actual story and objectively identify good, bad and average teams. I have named this system Opsera, which sounds like a real word and doesn't leave much to the imagination in the way of meaning. It is extremely simple; I take each team's total OPS, move the decimal point one place to the right and then just subtract their respective ERAs. The All-Time Opsera Rankings The Best Team Seasons Of All-Time The Worst Team Seasons Of All-Time Below is our full Opsera index for both teams and seasons. Franchise History Arizona Diamondbacks Atlanta Braves Baltimore Orioles Boston Red Sox Chicago Cubs Chicago White Sox Cincinnati Reds Cleveland Indians Colorado Rockies Detroit Tigers Florida Marlins Houston Astros Kansas City Royals Los Angeles Angels Los Angeles Dodgers Milwaukee Brewers Minnesota Twins New York Mets New York Yankees Oakland Athletics Philadelphia Phillies Pittsburgh Pirates St. Louis Cardinals San Diego Padres San Francisco Giants Seattle Mariners Tampa Bay Rays Texas Rangers Toronto Blue Jays Washington Nationals Season History 2009 2008 2007 2006 2005 2004 2003 2002 2001 2000 1999 1998 1997 1996 1995 1994 1993 1992 1991 1990 1989 1988 1987 1986 1985 1984 1983 1982 1981 1980 1979 1978 1977 1976 1975 1974 1973 1972 1971 1970 1969 1968 1967 1966 1965 1964 1963 1962 1961 1960 1959 1958 1957 1956 1955 1954 1953 1952 1951 1950 1949 1948 1947 1946 1945 1944 1943 1942 1941 1940 1939 1938 1937 1936 1935 1934 1933 1932 1931 1930 1929 1928 1927 1926 1925 1924 1923 1922 1921 1920 1919 1918 1917 1916 1915 1914 1913 1912 1911 1910 1909 1908 1907 1906 1905 1904 1903