Baseball defense is hard to measure. Catcher defense is even harder. There are lots of different aspects of catcher defense, including:
- Controlling the running game
- Actually fielding the ball
- Preventing passed balls and wild pitches
- Pitch framing and umpire psychology
- Game-calling and pitcher psychology
For the longest time, #1 was all we looked in stats like WAR. #2 a comparatively small part of the game while also being difficult to measure. #5 is anyone’s guess. Some work has been on #3, but I’m not sold on it yet. That leaves us with #4: getting umpires to call balls as strikes, and strikes as balls.
Measuring pitch framing is actually pretty easy. We have Pitch/Fx data about where a ball ended up. We have a good idea of where the strike zone should be. Therefore, we can count up pretty large sample sizes of called strikes that should be balls, and called balls that should be strikes. Do the math, and you know how many more strikes a catcher was able to call versus the average.
How good is Brian McCann? One of the best in baseball. From 2008-2013, McCann saved 22.2 runs per 7000 opportunities with pitch framing alone, according to an article by Pavlidis and Brooks at Baseball Prospectus. Among current MLB starting catchers, McCann is second only to Jonathan Lucroy.
Continue reading Does Pitch Framing Make Brian McCann the Yankee MVP?