Jose Mesa 1995
Had a 19 year career, mostly middling while pitching 1548 innings as middle reliever, stopper and starter.
Compiled over 34% of his total career WAR in 64 innings in 1995, finishing 2nd in Cy Young voting and 4th in MVP voting (ahead of actual Cy Young winner Randy Johnson, LOL).
Check out his ERA+ of 418. To put that in context, Mariano Rivera's highest ever season was 316.
