Based on winning percentage, the 1916 Philadelphia Athletics had the worst regular season in history at 36-117.
The 1962 New York Mets have the record for most losses in an MLB season with 120 losses.
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.
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