Here's the list of the top 20 live ball era FIP single season performances:

1) Pedro Martinez, 1.395, 1999 (HoF)

2) Dwight Gooden, 1.685, 1984

3) Bob Gibson, 1.774, 1968 (HoF)

4) Clayton Kershaw, 1.811, 2014 (active)

5) Sandy Koufax, 1.852, 1963 (HoF)

6) Sandy Koufax, 1.927, 1965 (HoF)

7) Tom Seaver, 1.931, 1971 (HoF)

8) Hal Newhouser, 1.966, 1946 (HoF)

9) Clayton Kershaw, 1.991, 2015 (active)

10) Matt Harvey, 2.005, 2013 (active)

11) Steve Carlton, 2.009, 1972 (HoF)

12) Luis Tiant, 2.041, 1968

13) Bob Moose, 2.063, 1968

14) Sandy Koufax, 2.071, 1966 (HoF)

15) Sandy Koufax, 2.076, 1964 (HoF)

16) Randy Johnson, 2.081, 1995 (HoF)

17) Sam McDowell, 2.081, 1965

18) Don Sutton, 2.082, 1968 (HoF)

19) Bob Veale, 2.107, 1965

20) Bill Gullickson, 2.111, 1965

Another fun fact: 13 of the 20 best single season performances (by FIP) occurred within a 1 decade span from 1963-72 and three in the three season span of 2013-15. Only four of the top 20 seasons came from the remaining 83 years of the live ball era.

Not so fun fact: Doc Gooden is the only non-active pitcher in the top 10 not in the Hall of Fame. He was on a clear HoF trajectory until a sharp decline and early end to his playing career due to substance abuse.

Sad fact: Bob Moose's career ended after he was killed in a car crash at 28 years old. While his career wasn't on a HoF trajectory at that point, it was obviously a very sad day for baseball.

Homer fact: Clayton Kershaw and Matt Harvey are the only two active players on the list. Even acknowledging my homerism, Matt Harvey hopefully entering 2017 fully healthy for the first time since his historic 2013 season is still worthy of some hype.

Opinion "fact": According to the expert opinion of /u/BillW87, Luis Tiant was a snub from the Hall. He's a career 229-172 pitcher across 19 seasons with 66.1 rWAR, 54.8 fWAR, 3.30 ERA, 3.47 FIP, and led the majors twice in ERA. If he didn't get stuck playing for the helpless 62-99 1969 Cleveland Indians who saddled him with a 9-20 record that season despite a 3.71 ERA there's a good chance his W-L would've been good enough to get him into the Hall.