Longest Winning, Losing Season Streaks All-time

Consecutive Winning Seasons:

1. 39 Yankees (1926-64)
2. 18 Orioles (1968-85)
3. 17 White Sox (surprise!) (1951-67)
4. 16 Braves (1887-1902)
4. 16 Red Sox (1967-82)
4. 16 Yankees (1993-2008+)
7. 15 Pirates (1899-1913)
7. 15 Cardinals (1939-53)
7. 15 Braves (1991-2005)


Consecutive Non-winning Seasons:

1. 16 Red Sox (1919-34; .500 in '34)
1. 16 Phillies (1933-48)
1. 16 Cubs (1947-62; .500 in '52)
1. 16 Pirates (1993-2008+)
5. 15 Athletics (1953-67)
6. 14 Phillies (1918-31)
6. 14 Brown (1946-59; .500 in '57)
6. 14 Mariners (1977-90)
6. 14 Brewers (1993-2006)

Thus the Pirates would set an ignominous record should they recore another losing leason in 2009.

The Reds just missed 20 straight winning seasons from 1961-81, going 79-83 (.488 in 1971.

The Indians recorded nothing above .519 from 1969-1993 (25 years)

The Phillies had only one winning season among 31 from 1918-48: .506 in 1932.

Finally, I came across this strange anomoly: The Louisville Colonels of the old (major league) American Association improved from 27-111 (.196) in 1889 to 88-44 (.667) the next year, 1890, an increase of .471!