Are there any pros who just know one game?

[dynacraze]

I hear there are ppl that are an expert in one game but they are not good at other games. For instance, some players are good at no limit but can't even beat limit holdem. Are there any pros that only play 1 game except no limit holdem?

I'm also talking about other games as well. Are there pros that only play say pot limit omaha or 7 card stud and that's all they know?