All time streaks under .500

       Franchise
  1 Boston Red Sox          15 years - 1919..1933
  1 Oakland Athletics       15 years - 1953..1967
  1 Philadelphia Phillies   15 years - 1933..1947
  1 Pittsburgh Pirates      15 years - 1993..2007
  5 Philadelphia Phillies   14 years - 1918..1931
  5 Seattle Mariners        14 years - 1977..1990
  7 Oakland Athletics       13 years - 1934..1946
  8 Baltimore Orioles       12 years - 1930..1941
  8 Detroit Tigers          12 years - 1994..2005
  8 Milwaukee Brewers       12 years - 1993..2004
 11 Atlanta Braves          11 years - 1903..1913
 11 Baltimore Orioles       11 years - 1946..1956
 11 Cincinnati Reds         11 years - 1945..1955
 11 Los Angeles Dodgers     11 years - 1904..1914
 15 Atlanta Braves          10 years - 1922..1931
 15 Baltimore Orioles       10 years - 1998..2007
 15 Chicago Cubs            10 years - 1953..1962
 15 Oakland Athletics       10 years - 1915..1924
 15 Tampa Bay Devil Rays    10 years - 1998..2007
 15 Washington Nationals    10 years - 1969..1978
 21 Cincinnati Reds          9 years - 1929..1937
 21 Milwaukee Brewers        9 years - 1969..1977
 21 Minnesota Twins          9 years - 1903..1911
 21 Pittsburgh Pirates       9 years - 1949..1957
 21 San Diego Padres         9 years - 1969..1977
 21 Chicago White Sox        9 years - 1927..1935