On June 14, 1982, the San Diego Padres signed Mitch Williams. Most people know the “Wild Thing” for the home run he allowed in the 1993 World Series. This week Richard looks back at Williams’ other defining characteristic, the one that earned him his nickname.

Do pitchers throw differently to other pitchers?

Comparing FIP, xFIP and tRA.

Johan Santana has (or had) a blister, and his pitching coach says it has affected his fastball. Checking that out with PITCHf/x seems easy enough, but therein lies the rub.

A look inside how Mike Pelfrey uses his sinker and what makes it effective using PITCHf/x.

Rules for success from PITCHf/x: Paint the corners, don’t hang the breaking balls and fire the high heater.

Smoltz and Eckersley: The two biggest transitions from successful starter to successful closer.

A subtle shift in pitch locations has come with a bigger shift in results for Brad Lidge.

Using some new info available at b-ref, Chris examines the inside-the-park home run.

A look at how the drop in velocity affects its effectiveness.