Who has the worst MLB season of all time?

Based on winning percentage, the 1916 Philadelphia Athletics had the worst regular season in history at 36-117.

Who has the most losses in an MLB season?

The 1962 New York Mets have the record for most losses in an MLB season with 120 losses.

What is the worst record to make the MLB Postseason?

The worst teams by winning percentage to make the MLB postseason are the the 2020 Houston Astros who went 29-31, and the the 2020 Milwaukee Brewers who went 29-31.
Based on number of losses, the worst team to make the MLB postseason is the 2005 San Diego Padres, who made the postseason with a 82-80 record. The San Diego Padres lost to the St. Louis Cardinals in the NL Divisional Series.

Worst MLB Regular Season Records

Team Year Record
1 Philadelphia Athletics 1916 36-117
2 Boston Braves 1935 38-115
3 New York Mets 1962 40-120
4 Philadelphia Athletics 1919 36-104
5 Detroit Tigers 2003 43-119
6 Pittsburgh Pirates 1952 42-112
7 Washington Senators 1909 42-110
8 Philadelphia Phillies 1942 42-109
9 Philadelphia Phillies 1941 43-111
St. Louis Browns 1939 43-111
Boston Red Sox 1932 43-111
12 Philadelphia Phillies 1928 43-109
Philadelphia Athletics 1915 43-109
14 Baltimore Orioles 2018 47-115
15 Boston Rustlers 1911 44-107
16 Detroit Tigers 2019 47-114
17 Boston Doves 1909 45-108
18 St. Louis Browns 1911 45-107
19 Philadelphia Phillies 1939 45-106
20 Philadelphia Phillies 1945 46-108
St. Louis Browns 1937 46-108
22 Philadelphia Phillies 1938 45-105
23 Boston Red Sox 1926 46-107
24 Philadelphia Phillies 1961 47-107
St. Louis Browns 1910 47-107
26 New York Mets 1965 50-112
27 Boston Red Sox 1925 47-105
28 Philadelphia Athletics 1920 48-106
29 St. Louis Cardinals 1903 43-94
Washington Senators 1903 43-94
31 Houston Astros 2013 51-111
Arizona Diamondbacks 2004 51-111
New York Mets 1963 51-111
34 Brooklyn Superbas 1905 48-104
35 Pittsburgh Pirates 2020 19-41
36 Philadelphia Athletics 1946 49-105
Philadelphia Athletics 1943 49-105
St. Louis Cardinals 1908 49-105
Boston Americans 1906 49-105
40 San Diego Padres 1969 52-110
Montreal Expos 1969 52-110
42 Chicago White Sox 1932 49-102
Washington Senators 1907 49-102
Boston Beaneaters 1906 49-102
45 Pittsburgh Pirates 1953 50-104
Detroit Tigers 1952 50-104
Washington Senators 1949 50-104
Philadelphia Phillies 1923 50-104
49 Philadelphia Phillies 1940 50-103
Boston Braves 1928 50-103
Team Year Record
1 New York Mets 1962 40-120
2 Detroit Tigers 2003 43-119
3 Philadelphia Athletics 1916 36-117
4 Boston Braves 1935 38-115
5 Baltimore Orioles 2018 47-115
6 Detroit Tigers 2019 47-114
7 Pittsburgh Pirates 1952 42-112
8 New York Mets 1965 50-112
9 Philadelphia Phillies 1941 43-111
St. Louis Browns 1939 43-111
Boston Red Sox 1932 43-111
12 Houston Astros 2013 51-111
Arizona Diamondbacks 2004 51-111
New York Mets 1963 51-111
15 Washington Senators 1909 42-110
16 San Diego Padres 1969 52-110
Montreal Expos 1969 52-110
18 Philadelphia Phillies 1942 42-109
19 Philadelphia Phillies 1928 43-109
Philadelphia Athletics 1915 43-109
21 Detroit Tigers 1996 53-109
Toronto Blue Jays 1979 53-109
New York Mets 1964 53-109
24 Boston Doves 1909 45-108
25 Philadelphia Phillies 1945 46-108
St. Louis Browns 1937 46-108
27 Baltimore Orioles 2019 54-108
Florida Marlins 1998 54-108
Oakland Athletics 1979 54-108
30 Boston Rustlers 1911 44-107
31 St. Louis Browns 1911 45-107
32 Boston Red Sox 1926 46-107
33 Philadelphia Phillies 1961 47-107
St. Louis Browns 1910 47-107
35 Baltimore Orioles 1988 54-107
Toronto Blue Jays 1977 54-107
37 Houston Astros 2012 55-107
Montreal Expos 1976 55-107
39 Philadelphia Phillies 1939 45-106
40 Philadelphia Athletics 1920 48-106
41 Atlanta Braves 1988 54-106
42 Tampa Bay Devil Rays 2002 55-106
Detroit Tigers 2002 55-106
44 Houston Astros 2011 56-106
Kansas City Royals 2005 56-106
Milwaukee Brewers 2002 56-106
Chicago White Sox 1970 56-106
Washington Senators 1963 56-106
49 Philadelphia Phillies 1938 45-105
50 Boston Red Sox 1925 47-105

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