Articles
Notes on the challenge game
Short pieces on what the data shows — findings, players, and strategy.
Jul 1
The bottom-edge problem
Umpires miss the low strike more than any other call. A look at why the bottom of the zone is where challenges are won and lost.
Jul 8
Reading the catcher's eye
How a single number — perception sigma — separates the catchers who can tell a ball from a strike at the margin from the ones who guess.
Jul 11
The wins on the table
Add up every unchallenged +EV miss and it comes to roughly 114 wins across the league. Where teams are leaving them.