Worst MLB Regular Seasons

Who has the worst MLB season of all time?

Based on winning percentage, the 1899 Cleveland Spiders had the worst regular season in history at 20-134.

Who has the most losses in an MLB season?

The 1899 Cleveland Spiders have the record for most losses in an MLB season with 134 losses.

Who has the worst run differential of all time in an MLB season?

The 1899 Cleveland Spiders have the record for the worst run differential of all time, finishing the 1899 MLB season with a differential of -724 runs. In that season the Spiders scored 529 runs and allowed 1,253.

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 Cleveland Spiders  1899 20-134
2 Pittsburgh Alleghenys 1890 23-113
3 St. Louis Browns 1897 29-102
4 Washington Nationals  1886 28-92
5 Philadelphia Athletics 1916 36-117
6 Kansas City Cowboys  1886 30-91
7 Boston Braves 1935 38-115
8 New York Mets 1962 40-120
9 Washington Senators 1904 38-113
10 Philadelphia Athletics 1919 36-104
11 St. Louis Browns 1898 39-111
12 Detroit Tigers 2003 43-119
13 Louisville Colonels  1895 35-96
14 Pittsburgh Pirates 1952 42-112
15 Washington Senators 1909 42-110
16 Louisville Colonels  1894 36-94
17 Philadelphia Phillies 1942 42-109
18 Boston Red Sox 1932 43-111
Philadelphia Phillies 1941 43-111
St. Louis Browns 1939 43-111
21 Philadelphia Athletics 1915 43-109
Philadelphia Phillies 1928 43-109
23 Louisville Colonels  1896 38-93
24 Baltimore Orioles 2018 47-115
25 Boston Rustlers 1911 44-107
26 Detroit Tigers 2019 47-114
27 Indianapolis Hoosiers  1887 37-89
28 Boston Doves 1909 45-108
29 St. Louis Browns 1911 45-107
30 St. Louis Browns 1895 39-92
31 Philadelphia Phillies 1939 45-106
32 Philadelphia Phillies 1945 46-108
St. Louis Browns 1937 46-108
34 Philadelphia Phillies 1938 45-105
35 Boston Red Sox 1926 46-107
36 Philadelphia Phillies 1961 47-107
St. Louis Browns 1910 47-107
38 St. Louis Browns 1896 40-90
39 New York Mets 1965 50-112
Oakland Athletics Recent 2023 50-112
41 Boston Red Sox 1925 47-105
42 Washington Senators  1893 40-89
43 Philadelphia Athletics 1920 48-106
44 Baltimore Orioles  1892 46-101
45 St. Louis Cardinals 1903 43-94
Washington Senators 1903 43-94
47 Arizona Diamondbacks 2004 51-111
Houston Astros 2013 51-111
New York Mets 1963 51-111
50 Brooklyn Superbas 1905 48-104
Team Year Record
1 Cleveland Spiders  1899 20-134
2 New York Mets 1962 40-120
3 Detroit Tigers 2003 43-119
4 Philadelphia Athletics 1916 36-117
5 Boston Braves 1935 38-115
6 Baltimore Orioles 2018 47-115
7 Detroit Tigers 2019 47-114
8 Pittsburgh Alleghenys 1890 23-113
9 Washington Senators 1904 38-113
10 Pittsburgh Pirates 1952 42-112
11 New York Mets 1965 50-112
Oakland Athletics Recent 2023 50-112
13 St. Louis Browns 1898 39-111
14 Boston Red Sox 1932 43-111
Philadelphia Phillies 1941 43-111
St. Louis Browns 1939 43-111
17 Arizona Diamondbacks 2004 51-111
Houston Astros 2013 51-111
New York Mets 1963 51-111
20 Washington Senators 1909 42-110
21 Arizona Diamondbacks 2021 52-110
Baltimore Orioles 2021 52-110
Montreal Expos 1969 52-110
San Diego Padres 1969 52-110
25 Philadelphia Phillies 1942 42-109
26 Philadelphia Athletics 1915 43-109
Philadelphia Phillies 1928 43-109
28 Detroit Tigers 1996 53-109
New York Mets 1964 53-109
Toronto Blue Jays 1979 53-109
31 Boston Doves 1909 45-108
32 Philadelphia Phillies 1945 46-108
St. Louis Browns 1937 46-108
34 Baltimore Orioles 2019 54-108
Florida Marlins 1998 54-108
Oakland Athletics 1979 54-108
37 Boston Rustlers 1911 44-107
38 St. Louis Browns 1911 45-107
39 Boston Red Sox 1926 46-107
40 Philadelphia Phillies 1961 47-107
St. Louis Browns 1910 47-107
42 Baltimore Orioles 1988 54-107
Toronto Blue Jays 1977 54-107
44 Houston Astros 2012 55-107
Montreal Expos 1976 55-107
Washington Nationals 2022 55-107
47 Philadelphia Phillies 1939 45-106
48 Philadelphia Athletics 1920 48-106
49 Atlanta Braves 1988 54-106
50 Detroit Tigers 2002 55-106
Tampa Bay Devil Rays 2002 55-106

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