With the caveat that more new pitches may be revealed this spring, so far three pitchers said they are working on new pitches. And my intuition is that a fourth pitcher may reveal a new pitch. Let’s look at each of the four pitchers.
For a broader look at pitch types for all Diamondbacks pitchers, see this AZ Snake Pit article.
Tommy Henry.
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With 5 pitches including each category fastball, breaking, and offspeed, it’s not that he has an urgent need.