All Time Worst MLB Regular Seasons

Who has the worst MLB season of all time?

Based on winning percentage, the 1899 Cleveland Spiders had the worst MLB 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

By Worst Winning Percentage By Worst Win %
By Most Losses

	Team	Year	Record
1	Cleveland Spiders	1899	20-134
2	Chicago White Sox Partial Season	2024	3-15
3	Pittsburgh Alleghenys	1890	23-113
4	Colorado Rockies Partial Season	2024	4-15
	Miami Marlins Partial Season	2024	4-15
6	St. Louis Browns	1897	29-102
7	Washington Nationals	1886	28-92
8	Philadelphia Athletics	1916	36-117
9	Kansas City Cowboys	1886	30-91
10	Boston Braves	1935	38-115
11	New York Mets	1962	40-120
12	Washington Senators	1904	38-113
13	Philadelphia Athletics	1919	36-104
14	St. Louis Browns	1898	39-111
15	Detroit Tigers	2003	43-119
16	Louisville Colonels	1895	35-96
17	Pittsburgh Pirates	1952	42-112
18	Washington Senators	1909	42-110
19	Louisville Colonels	1894	36-94
20	Philadelphia Phillies	1942	42-109
21	Boston Red Sox	1932	43-111
	Philadelphia Phillies	1941	43-111
	St. Louis Browns	1939	43-111
24	Philadelphia Athletics	1915	43-109
	Philadelphia Phillies	1928	43-109
26	Louisville Colonels	1896	38-93
27	Baltimore Orioles	2018	47-115
28	Boston Rustlers	1911	44-107
29	Detroit Tigers	2019	47-114
30	Indianapolis Hoosiers	1887	37-89
31	Boston Doves	1909	45-108
32	St. Louis Browns	1911	45-107
33	St. Louis Browns	1895	39-92
34	Philadelphia Phillies	1939	45-106
35	Philadelphia Phillies	1945	46-108
	St. Louis Browns	1937	46-108
37	Philadelphia Phillies	1938	45-105
38	Houston Astros Partial Season	2024	6-14
39	Boston Red Sox	1926	46-107
40	Philadelphia Phillies	1961	47-107
	St. Louis Browns	1910	47-107
42	St. Louis Browns	1896	40-90
43	New York Mets	1965	50-112
	Oakland Athletics	2023	50-112
45	Boston Red Sox	1925	47-105
46	Washington Senators	1893	40-89
47	Philadelphia Athletics	1920	48-106
48	Baltimore Orioles	1892	46-101
49	St. Louis Cardinals	1903	43-94
	Washington Senators	1903	43-94

	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
	Baltimore Orioles	2018	47-115
7	Detroit Tigers	2019	47-114
8	Pittsburgh Alleghenys	1890	23-113
	Washington Senators	1904	38-113
10	Pittsburgh Pirates	1952	42-112
	Oakland Athletics	2023	50-112
	New York Mets	1965	50-112
13	St. Louis Browns	1898	39-111
	Philadelphia Phillies	1941	43-111
	St. Louis Browns	1939	43-111
	Boston Red Sox	1932	43-111
	Houston Astros	2013	51-111
	Arizona Diamondbacks	2004	51-111
	New York Mets	1963	51-111
20	Washington Senators	1909	42-110
	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
	Philadelphia Phillies	1928	43-109
	Philadelphia Athletics	1915	43-109
	Detroit Tigers	1996	53-109
	Toronto Blue Jays	1979	53-109
	New York Mets	1964	53-109
31	Boston Doves	1909	45-108
	Philadelphia Phillies	1945	46-108
	St. Louis Browns	1937	46-108
	Baltimore Orioles	2019	54-108
	Florida Marlins	1998	54-108
	Oakland Athletics	1979	54-108
37	Boston Rustlers	1911	44-107
	St. Louis Browns	1911	45-107
	Boston Red Sox	1926	46-107
	Philadelphia Phillies	1961	47-107
	St. Louis Browns	1910	47-107
	Baltimore Orioles	1988	54-107
	Toronto Blue Jays	1977	54-107
	Washington Nationals	2022	55-107
	Houston Astros	2012	55-107
	Montreal Expos	1976	55-107
47	Philadelphia Phillies	1939	45-106
	Philadelphia Athletics	1920	48-106
	Atlanta Braves	1988	54-106
	Detroit Tigers	2002	55-106
	Tampa Bay Devil Rays	2002	55-106
	Kansas City Royals	2023	56-106
	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

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