Umpires Are Less Blind Than They Used To Be
The Effect of Umpires on Baseball: Umpire Runs Created (uRC)
We May Never Find Out How Good Umpires Can Be
The Pursuit of the Elusive Umpire Perfect Game - The Ringer
MLB umpire Paul Emmel doesn't need surgery to be bigger man
On average, how many calls do umpires get wrong in a game? - Quora
These MLB umpires have the worst strike zones - The Washington Post
OC] Home Plate Umpire Accuracy by Age
On average, how many calls do umpires get wrong in a game? - Quora
The Average Umpire Is Almost 50. The Best Ones Might Be in Their 30s. - WSJ
We May Never Find Out How Good Umpires Can Be