A look at Arroyo’s quirky delivery with PITCHf/x.

A look at how age affects pitchers’ fastball speed using PITCHf/x data

The inner workings of a slider, plus a few more words on curveballs.

A look at what attributes of a curveball makes it effective.

A look at Cano’s slow start this season

At 44, Johnson has come back from the DL to pitch great in his first three starts. Here, with the help of PITCHfx, is how he’s doing it

How relief pitchers fare depending on the number of days they’ve had off

Here’s how he’s getting the job done.

Four teams off on the right foot to start the season.

How Tim Hudson succeeded without his best stuff