Who has the best ERA for a MLB season
2001 Seattle Mariners they went 116-46.
The 1906 Chicago Cubs have the best winning percentage for a season with .763. The Cubs 1906 record was 116-36.
The 2008 Blue Jays have the greatest season comback ever
As of the end of the 2007 season the Philadelphia Phillies have lost 10,028 games, the most in MLB history.
The MLB season usually starts from the beginning of April.
He was one of the best pitchers in MLB history.
After the regular season. Hence the word post.