Uncover the Untold Stories Behind Baseball’s Most Jaw-Dropping Records and Legendary Feats
Best Record in a Season
The four top single-season winning percentages all came before the establishment of the 162-game MLB season. The decade of 1900-09 included the top-three teams on this leaderboard, while the 2001 Seattle Mariners top the all-time 162-game season standings.

Worst Record in a Season
The teams with the five worst records of the modern era all played in 1935 or earlier, except for the 1962 Mets in their 120-loss inaugural season. The Philadelphia Athletics are the owners of both the worst- and fifth-worst records of all time.



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