Do you know the pitcher with the highest swinging-strike rate in all of baseball this year? Well, it’s Jacob deGrom, no surprises there; it’s such an obvious answer that I probably didn’t need to ask. But do you know the pitcher with the second-highest swinging-strike rate? It’s Raisel Iglesias, and the Angels’ closer has been impressive so far this season, even if his run prevention numbers don’t quite show it yet.
If I could see only one pitching statistic, I’d choose swinging-strike rate. That’s not to say that nothing else matters; that’s decidedly not the case, and there are easy examples of both pitchers who miss bats but aren’t effective and pitchers who are effective without missing bats. But as a first pass, swinging strikes are great. Everything else is contextual. Called strike? That’s because the batter didn’t swing. Foul? It’s not always worth a strike. Groundball? The batter could hit it through the defense or find a gap. A swing and miss is absolute.
You probably don’t need to hear that. Whiffs have been the premium currency of pitching for a long time, long before we had the pitch-level data to track them accurately. I merely thought I’d mention it, because wow does Iglesias miss a lot of bats.
Most closers operate with a common template. Throw a really good fastball — a really good fastball — and spot an unhittable secondary pitch off of it. It’s not always about velocity, though it often is. But it’s almost always about a fastball and one pitch spotted off of it — a guessing game for the hitter with two bad answers.
Iglesias is that pitcher, kind of. Against righties, he relies on a four-seam fastball and a devastating slider. He mixes in a smattering of two-seamers and changeups, but mostly for show; more than 80% of his pitches are fastballs or sliders. Against lefties, Iglesias also relies on two pitches: his fastball and changeup. He throws each of them roughly 40% of the time, with sinkers and sliders comprising the remainder of his offerings.
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