In today's SI Five-Tool Newsletter, we take a look at the strike zone following Laz Díaz's borderline call in ALCS Game 4.

Next season, MLB commissioner Rob Manfred is hoping to roll out the automated ball-strike challenge system league-wide — a ...

As shown by Mills, the strike zone has evolved since 2007, the year when Major League Baseball began using Pitch f/x technology to monitor the speed, movement, and location of pitches.

The players involved are disciplined, they know the strike zone, they are not wild swingers. Judge, for one, has grown so much as a hitter. In his third year, ...

Challenge System will take its next measured step toward regular-season implementation when it is used in the All-Star Game.

MLB has tweaked Triple A's electronic strike zone, for the benefit of robot umps — and crouching hitters — everywhere. Why you should care.

Roegele determined that the strike zone has expanded on average from about 435 square inches to about 475 square inches — an increase of roughly 9 percent — from 2009 through 2014, ...

Through Sunday, there have been 35 violations for catcher’s interference, which is called when a batter’s swing strikes the catcher’s glove before coming through the strike zone.

Nevertheless, players interviewed about this change say the strike zone feels noticeably smaller. The Athletic polled 15 MLB players, as well as more than a dozen coaches, executives and analysts ...

Using PITCHf/x data, Roegele found that in 2008 the average size of an MLB umpire's strike zone was 436 square inches. By 2012 that number had ballooned to 456 square inches, and last season it ...