The Nastiest Pitches of the World Series, Almost Objectively
In any given nine-inning baseball game, there are upward of 250 pitches thrown. More than half of those pitches, more often than not, are going to be thrown somewhere in the range of 90-97 mph. They’re all going to move somewhere between two and 12 inches, and most of them will travel through the same theoretical three-square-foot box. It’s easy for these pitches to begin blending together. That’s why we appreciate the ones that truly set themselves apart. These ones are easy to spot.
This is similar to a post I did last year around this time. The mission: find the 10 individual pitches deemed nastiest by my subjective criteria, hopefully learn something about those pitches and what it is that makes them so effective, and then see them in action so we have a reference point and something extra to keep an eye out for the in World Series.
How it’s done: I expanded a bit on last year’s criteria. Last year’s criteria, it was just whiff rate and ground ball rate, per individual pitch. Those are the two best common results-based outcomes a pitch can have. A complete swing-and-miss, or the weakest contact of the three main batted ball types. This year, I folded in two process-based characteristics along with the results, adding velocity and spin rate, with spin data coming from Statcast. Two big things that make a pitch aesthetically pleasing, to us, are speed and movement. Velocity and spin rate should capture that. Two big things that make a pitch effective, to pitchers, are whiffs and grounders. We’ve got that down. Oh, also, an executive decision I made and forgot to mention: for four-seam fastballs, I substituted pop-up rate for ground ball rate. Felt like the right thing to do, given four-seams are the one pitch, more than any other, thrown up in the zone with no intention of getting grounders. Anyway, I calculated z-scores for each of the four selected characteristics, for each pitch type, added them up, and found 10 pitches that stood above the rest. These are those 10 pitches.