List of best Major League Baseball season won-loss records
Season records
Columns: Year | Franchise | League | Percentage | Finish
1906 | Chicago Cubs | NL | 0.763 | Lost 1906 World Series | 1902 | Pittsburgh Pirates | NL | 0.741 | National League Champions | 1886 | Chicago White Stockings | NL | 0.726 | Lost 1886 World Series | 1909 | Pittsburgh Pirates | NL | 0.724 | Won 1909 World Series | 1954 | Cleveland Indians | AL | 0.721 | Lost 1954 World Series | 2001 | Seattle Mariners | AL | 0.716 | Lost 2001 ALCS | 1927 | New York Yankees | AL | 0.714 | Won 1927 World Series | 1886 | Detroit Wolverines | NL | 0.707 | 2nd place in National League | 1897 | Boston Beaneaters | NL | 0.705 | Lost 1897 Temple Cup | 1907 | Chicago Cubs | NL | 0.704 | Won 1907 World Series | 1931 | Philadelphia Athletics | AL | 0.704 | Lost 1931 World Series | 1887 | St. Louis Browns | AA | 0.704 | Lost 1887 World Series | 1998 | New York Yankees | AL | 0.703 | Won 1998 World Series | 1939 | New York Yankees | AL | 0.702 | Won 1939 World Series