Quit Calling Balls in My Heart (Zone)

In his recent piece about umpire accuracy, Davy Andrews noted that plate umpires correctly called 99.26% of heart zone pitches in 2023. When I first read that number, I didn’t think missed calls in the heart zone warranted any closer investigation. For most of us, ninety-nine point anything is as good as 100; you don’t spend much time worrying about the 0.01% of germs Purell can’t kill. Then again, if you were to consider the sheer amount of bacteria on your hands at any given moment, you might opt for a second squirt of sanitizer. A tiny percentage of a tremendous number is still going to be a pretty big number. The same is true for missed calls in the heart zone. There aren’t quite as many pitches in an MLB season as there are germs on your phone screen, but there are enough that a few tenths of percent of heart zone offerings still represents a pretty hefty figure. In 2023, plate umpires watched 381 pitches sail over the heart of the plate without signaling a strike. When you frame it that way (pun absolutely intended), it actually sounds pretty bad.
I wasn’t nearly as surprised to learn that plate umpires missed 428 calls in the chase zone last season. Offerings in the chase zone are designed to look hittable out of the pitcher’s hand. An especially talented catcher can make them look hittable as they reach his glove, too. Meanwhile, a batter might like to earn a few extra balls inside the zone, but he doesn’t have the same influence over calls as do his opponents. Besides, if a hitter recognizes that a pitch is coming for the heart zone, he’s not going to wriggle and contort his body in hopes of inducing a missed call – he’s going to swing. To that end, batters are much more likely to swing in the heart zone than the chase zone, which means that on a rate basis, umpires miss significantly more calls over the heart of the plate because there are fewer total pitches there that need to be called. While 381 and 428 are similar figures, batters took 2.4 times as many pitches in the chase zone as in the heart zone. Apparently, it’s harder than I thought to call strikes what they are. Read the rest of this entry »








