junkball + -er.
junkballer (plural junkballers)
- (tennis, sometimes derogatory) A player that hits a lot of slow shots.
- (baseball) A pitcher that relies heavily on off-speed pitches.
2007 June 14, Lee Jenkins, “At 44, Wells Is the Anti-Clemens”, in New York Times:
From the beginning, Clemens was a fireballer, Wells more of a junkballer.