The Nastiest Pitches We’ll See in the World Series, Subjectively
I had slightly higher hopes for this post. Don’t get me wrong, I’m pleased with the final result. But when I first cooked this idea up, my plan was to utilize the Baseball Prospectus PITCHf/x leaderboards to pull velocity, horizontal movement, vertical movement, whiff rate and groundball rate to determine the nastiest pitches we’ll see in the World Series. But, there were a few problems.
While more velocity generally makes a pitch nastier, that’s not always true, especially in the case of offspeed pitches. More movement definitely makes a pitch nastier, but movement is hard to compare across a PITCHf/x leaderboard because a lot of it is dependent on arm slot and you get some funky values from guys who throw with funky motions.
So then, I was left with just whiff rate and groundball rate, but I actually kind of like that. Those are two of the best outcomes, and they’re the direct result of some of the things we weren’t able to capture, such as velocity, horizontal movement and vertical movement. The most dominant outcome of a pitch, for a pitcher, is a swing and miss. But not all guys dominate by getting whiffs, and so they don’t all pitch that way. Some guys dominate by getting weak contact, and ground balls yield the weakest contact of the three main batted ball types (grounders, flies and line drives). But the guys who really dominate are the ones who get the best of both worlds: whiffs and grounders.
Read the rest of this entry »