Umpire Strike Zone Analysis

The 2017 Strike Zone Mid-Season Report

Ian York takes a look at the subtle shifts in the strike zone between 2008, 2016, and 2017 using his typical blend of charts, gifs, and words.

Pitches and Stuff: The Gyroball

Mike Richmond explores the mythical gyroball to see if it actually exists and, if it does, how it is thrown and what type of break it has.

Pitches and Stuff: The Slider

The slider is thrown with more speed and less break than a curveball, yet less speed and more break than a fastball. Mike Richmond explains how and why.

Pitches and Stuff: Two-Seam Fastball

The two-seam fastball is thrown at the same speed as the four-seam fastball, but it can have a very distinct break. Mike Richmond explores why.

Pitches and Stuff: Arm Angles

Pitchers choose different arm angles: Why? Using Pitchf/x, Michael Richmond explains how the tilt of the arm affects the break of the ball.

Pitches and Stuff: The Changeup

Changing speeds is one of the most effective ways to fool a batter. Author Mike Richmond shows how a changeup is thrown and why it is so effective.

Pitches and Stuff: The Curveball

Why does the curveball curve? Understanding the interaction of the ball with the air can help you see when a pitcher is on his game or having a bad day.

Pitches and Stuff: The Fastball

The fastball is the most prevalent pitch in MLB and Michael Richmond explains the physics, including backspin and Magnus force, to an effective pitch.

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