Some thoughts:
There are only two in the majors this year - the Dodgers' Haeger (who the Nats beat this season) and Wakefield.
There are some major disadvantages:
- lots of passed balls, wild pitches, hit batsmen. Catchers hate catching knucklers.
- slow to the plate means easier to steal against.
Advantages
- hitters don't see very many of them these days, can't really prepare properly. Tough to hit when moving well.
- easy on the arm of the pitcher.
Nats once had 4 knuckleballers in the rotation, WWII era (4-man rotation).
