Wells and Kells: A Cutter Case Study

Last week, in his update on pitch mix, my colleague Davy Andrews told a tale as old as time (or at least 2008, when the pitch-tracking era began): fastball usage is on the decline, largely to the benefit of sliders (and sweepers). But this year, there’s a new wrinkle: cutter usage is on the rise, too.
Per Statcast, pitchers are turning to cutters more than they have in any season since 2008. That usage is still at just 7.6%, but the year-over-year jump of 0.7% is the second highest on record. Plus, as Davy and the folks over at Prospects Live put it, a lot of the cutter’s value lies purely in its mere existence; it doesn’t have to be used a ton to be a worthwhile offering. That’s because, out of a pitcher’s hand, the cutter bears resemblance to both a fastball and a slider. When pitchers are struggling to tunnel their heater and slide-piece, the problem might be that there’s simply too large a movement and/or velocity gap between the two offerings — one that a cutter can bridge. As long as the hitter has to think not only about the dissimilar fastball and slider, but also a cutter, it can make a big difference, even if the cutter doesn’t show up all that often.
Along those lines, horizontal movement gaps between fastballs and sliders have only grown in the age of the sweeper. The new “riding slider” also tends to have larger platoon splits than other similar breakers, which is where the cutter can come in handy yet again due to its relative platoon neutrality. Read the rest of this entry »








