Based on winning percentage, the 1906 Chicago Cubs had the best regular season in history at 116-36, but did not win the World Series. The Cubs lost to the Chicago White Sox in the World Series.
The 1906 Chicago Cubs and 2001 Seattle Mariners are tied for the most wins in a single MLB season with 116 wins.
There has never been a MLB team with an undefeated regular season. The closest anybody has come is the 2020 Los Angeles Dodgers, who had 17 losses, however that happened in a 60 game season.
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