List of best Major League Baseball season won-loss records Season records Season records

| Year_ | Franchise | League | Percentage | Finish |
|---|---|---|---|---|
| 1887 | St. Louis Browns | AA | .704 | Lost 1887 World Series |
| 1998 | New York Yankees | AL | .703 | Won 1998 World Series |
| 1939 | New York Yankees | AL | .702 | Won 1939 World Series |