But don't get too worked up with the variety of offerings a pitcher has. It's not like Aroldis Chapman or Mariano Rivera mixed up their pitches to be successful.
There is no magic formula for success. But keeping it in the strike zone, not giving free passes, and allowing hitters to get themselves out, which they all do the majority of the time, is about as close as it gets. And if a pitcher cna do that with one pitch or if he needs three, it doesn't matter. What matters is that he does it...