Sons is okay. But I'd drop the "of Pitches" call them the Sons and then have the team motto be "Those Sons of Pitches" Lots classier. Cereal Killers is easy, just drop the cereal. Killers is fairly crass though. Ump Yours? Toss it.
Sons is still kind of a weird name though. Like you wouldn't call a team Daughters. Would work better if there were called the Suns and then you just extended the bitches/pitches pun to a suns/sons pun also.
Considering changing the Avengers name to something like Forgotton Sons or Favored Sons or something just to prove you all wrong. Worldwide franchise in the making.
