On Wednesday, we took a look at the anomalous offensive outcomes of 2015: we had oppo homers from batters who have never hit them before, some of the slowest men in baseball hitting triples, and a guy with below average ISO marks hitting an almost 500-foot home run. It was a great reminder that baseball is really, really weird, and every season there’s at least few events that you will rarely — if ever — see again.
Today, we’re going to revisit that same idea except with defense. We can always watch highlight reels of the best defensive plays of the year, because watching Mike Trout perch on top of the wall in center field to rob a home run is a singular pleasure. It’s simple human nature to enjoy that. What highlight reels lack, however, is the context of the players making the plays: we expect Andrelton Simmons to go in the hole at shortstop to pick a ground ball, leap in the air, and fire a bullet across the diamond to get the runner at first. We do not expect Jhonny Peralta to do the same. That’s why if Peralta made that exact same play (he didn’t, but just suspend your belief for a moment), it wouldn’t necessarily be more impressive on an overall level, but it certainly would be on a personal one. For Simmons, that’s business as usual. For Peralta, it’s a once or twice in a career event. That deserves recognition — and celebration.
The usual caveats apply, given that we’re looking at only one-year samples of defensive data. There’s a lot of noise here — we know that. The aim of this post is to find the joy in that great mixture of noise and talent. There are a spectrum of posts on this illustrious website: toward one end we find incredible batted-ball breakdowns of pitchers and hitters that stretch our understanding of baseball; toward the other, we find the carnivalesque atmosphere of a GIF-addled home run post. This piece will stumble gleefully, Mardi Gras crown askew, in the direction of only one end of that spectrum.
On the technical side, we’re employing a few types of data for this pursuit: UZR/150, DRS, and Inside Edge fielding data, the latter of which ranks each defensive play made on a six-step scale of how often an average fielder at the position would make the play in question — from the categories of “Impossible” to “Almost Certain.” I’ve also used Baseball Reference’s always useful play index, as well as some Baseball Savant. Now onto the findings!
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