The Limitations of Promising Pitch Comps
I’m never really sure how much to review recent articles. Last week I wrote a lot about pitch comps. Compared Henderson Alvarez‘s changeup to Felix Hernandez‘s changeup. Compared guys to certain signature pitches like Aroldis Chapman‘s fastball and Clayton Kershaw‘s slider. Wound up with this Marcus Stroman absurdity, in which Stroman is flattered by some of the strongest comps in the game. The basic idea: Stroman’s regular fastball shares the same traits with Johnny Cueto‘s. His sinker shares the same traits with Roy Halladay‘s. His curveball shares the same traits with Jose Fernandez’s. And so on. The whole idea was comparing pitches to other pitches based on average velocity, horizontal movement, and vertical movement. It’s a little informative, and sometimes a lot of fun.
I wanted to put together this follow-up, which serves to caution you not to make too much of a good comp. There’s more that goes into a pitch than how it moves, and how fast it moves. There’s definitely more than that, when it comes to how a pitch works within a given repertoire of many pitches. And, our examples: Cole Hamels and J.A. Happ. Last week, when I ran some pitch comps, I found that Happ’s changeup compares the strongest with Hamels’ changeup. For one thing, we know Happ’s changeup isn’t as good as Hamels’ changeup. For another thing, it goes deeper than this.