Cubs & Mets Pitching Staffs Having Historic Seasons So Far According to FIP-

That is Fielding Independent ERA adjusted for league average and park effects. Data from Fangraphs.

Here are the top 13 since 1900. I wanted to have the top 10 plus the Cubs and Mets from this year but since one of the teams is from 1994 (Braves) and that season only had about 115 games, I went with the top 13. A lower number is better. 77 is like saying their ERA is 77% of the league average.

Season	Team	FIP-
2016	Mets	77
1996	Braves	80
2016	Cubs	81
1911	Giants	81
1909	Cubs	81
1908	Giants	81
2013	Tigers	82
2003	Dodgers	82
2003	Yankees	82
1997	Braves	82
1994	Braves	82
1971	White Sox	82
1904	Athletics	82