Which pitchers work fast, and are their defenses helped?

A report from the first PITCHf/x summit.

Why is Jack Cust in a slump to start the 2008 season?

New technology lets us explore longstanding baseball questions

After ten years in the minor leagues, Jack Cust burst onto the major league scene in 2007 with 26 home runs. This article examines Cust’s 2007 performance, looking at his strengths and weaknesses as a hitter.