World Series Champions by Regular Season Record (extreme)

Can you guess the World Series Champions by their regular season winning percentage?

Try the shorter, post-1950 version of this quiz here.
As of the end of the 2019 season.
Answering with the current franchise name is sufficient for previous corresponding incarnations.
'=' denotes identical winning percentage (W%) over the same length of season. Where W% is identical over different lengths of seasons, teams are ranked by the total number of regular season games.
Source: Wikipedia.
Quiz by elijahwade
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Last updated: September 30, 2020
First submittedJuly 26, 2018
Times taken18
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Year
League
W-L
W%
Franchise
1909
NL
110-42
.724
Pittsburgh Pirates
1927
AL
110-44
.714
New York Yankees
1907
NL
107-45
.704
Chicago Cubs
1998
AL
114-48
.704
New York Yankees
1939
AL
106-45
.702
New York Yankees
1932
AL
107-47
.695
New York Yankees
1929
AL
104-46
.693
Philadelphia Athletics
1912
AL
105-47
.691
Boston Red Sox
1942
NL
106-48
.688
St. Louis Cardinals
1905
NL
105-48
.686
New York Giants
1919
NL
96-44
.686
Cincinnati Reds
1944
NL
105-49
.682
St. Louis Cardinals
1910
AL
102-48
.680
Philadelphia Athletics
1961
AL
109-53
.673
New York Yankees
1911
AL
101-50
=.669
Philadelphia Athletics
1915
AL
101-50
=.669
Boston Red Sox
1970
AL
108-54
=.667
Baltimore Orioles
1975
NL
108-54
=.667
Cincinnati Reds
1986
NL
108-54
=.667
New York Mets
2018
AL
108-54
=.667
Boston Red Sox
1936
AL
102-51
.667
New York Yankees
1930
AL
102-52
=.662
Philadelphia Athletics
1937
AL
102-52
= 662
New York Yankees
1903
AL
91-47
.659
Boston Americans
1928
AL
101-53
=.656
New York Yankees
1931
NL
101-53
=.656
St. Louis Cardinals
1941
AL
101-53
=.656
New York Yankees
1953
AL
99-52
.656
New York Yankees
1940
NL
100-53
.654
Cincinnati Reds
1938
AL
99-53
.651
New York Yankees
1917
AL
100-54
.649
Chicago White Sox
1923
AL
98-54
.645
New York Yankees
1908
NL
99-55
.643
Chicago Cubs
1984
AL
104-58
.642
Detroit Tigers
1955
NL
98-55
.641
Brooklyn Dodgers
2016
NL
103-58
.640
Chicago Cubs
1920
AL
98-56
=.636
Cleveland Indians
1943
AL
98-56
=.636
New York Yankees
1950
AL
98-56
=.636
New York Yankees
1951
AL
98-56
=.636
New York Yankees
1968
AL
103-59
=.636
Detroit Tigers
2009
AL
103-59
=.636
New York Yankees
1947
AL
97-57
=.630
New York Yankees
1949
AL
97-57
=.630
New York Yankees
1954
NL
97-57
=.630
New York Giants
1956
AL
97-57
=.630
New York Yankees
1976
NL
102-60
.630
Cincinnati Reds
1946
NL
98-58
.628
St. Louis Cardinals
1913
AL
96-57
.627
Philadelphia Athletics
1967
NL
101-60
.627
St. Louis Cardinals
1948
AL
97-58
.626
Cleveland Indians
1995
NL
90-54
.625
Atlanta Braves
2017
AL
101-61
.623
Houston Astros
1925
NL
95-58
=.621
Pittsburgh Pirates
1934
NL
95-58
=.621
St. Louis Cardinals
1969
NL
100-62
=.617
New York Mets
1977
AL
100-62
=.617
New York Yankees
1952
AL
95-59
=.617
New York Yankees
1957
NL
95-59
=.617
Milwaukee Braves
1960
NL
95-59
=.617
Pittsburgh Pirates
1906
AL
93-58
=.616
Chicago White Sox
1935
AL
93-58
=.616
Detroit Tigers
1914
NL
94-59
=.614
Boston Braves
1921
NL
94-59
=.614
New York Giants
1978
AL
100-63
.613
New York Yankees
1963
NL
99-63
=.611
Los Angeles Dodgers
1989
AL
99-63
=.611
Oakland Athletics
2002
AL
99-63 (WC)
=.611
Anaheim Angels
2005
AL
99-63
=.611
Chicago White Sox
1966
AL
97-63
.606
Baltimore Orioles
1979
NL
98-64
=.605
Pittsburgh Pirates
1983
AL
98-64
=.605
Baltimore Orioles
1999
AL
98-64
=.605
New York Yankees
2004
AL
98-64 (WC)
=.605
Boston Red Sox
1922
NL
93-61
.604
New York Giants
1972
AL
93-62
.600
Oakland Athletics
1965
NL
97-65
=.599
Los Angeles Dodgers
1971
NL
97-65
=.599
Pittsburgh Pirates
2013
AL
97-65
=.599
Boston Red Sox
1933
NL
91-61
.599
New York Giants
1924
AL
92-62
=.597
Washington Senators
1958
AL
92-62
=.597
New York Yankees
1918
AL
71-51
.595
Boston Red Sox
1962
AL
96-66
=.593
New York Yankees
1992
AL
96-66
=.593
Toronto Blue Jays
2007
AL
96-66
=.593
Boston Red Sox
1916
AL
91-63
.591
Boston Red Sox
1991
AL
95-67
=.586
Minnesota Twins
1993
AL
95-67
=.586
Toronto Blue Jays
2015
AL
95-67
=.586
Kansas City Royals
1988
NL
94-67
.584
Los Angeles Dodgers
1973
AL
94-68
=.580
Oakland Athletics
2012
NL
94-68
=.580
San Francisco Giants
1926
NL
89-65
.578
St. Louis Cardinals
1945
AL
88-65
.575
Detroit Tigers
1964
NL
93-69
=.574
St. Louis Cardinals
2019
NL
93-69
=.574
Washington Nationals
1981
NL
63-47 (WC)
.573
Los Angeles Dodgers
1982
NL
92-70
=.568
St. Louis Cardinals
1996
AL
92-70
=.568
New York Yankees
1997
NL
92-70 (WC)
=.568
Florida Marlins
2001
NL
92-70
=.568
Arizona Diamondbacks
2008
NL
92-70
=.568
Philadelphia Phillies
2010
NL
92-70
=.568
San Francisco Giants
1959
NL
88-68
.564
Los Angeles Dodgers
1980
NL
91-71
=.562
Philadelphia Phillies
1985
AL
91-71
=.562
Kansas City Royals
1990
NL
91-71
=.562
Cincinnati Reds
2003
NL
91-71 (WC)
=.562
Florida Marlins
1974
AL
90-72
=.556
Oakland Athletics
2011
NL
90-72 (WC)
=.556
St. Louis Cardinals
2014
NL
88-74 (WC)
.543
San Francisco Giants
2000
AL
87-74
.540
New York Yankees
1987
AL
85-77
.525
Minnesota Twins
2006
NL
83-78
.516
St. Louis Cardinals
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