Felix Hernandez

In '05, '06, '07 and '08, I wasn't throwing any changeups at all. Maybe two or three per game. In '09, I started playing with the grip, started throwing it in the bullpen and playing catch. It came out really good.

It's hard to shape glass. It took me years of practice, and as a result, I've never gotten bored with it. It's difficult. Every time I come into the studio, I've got some sort of new challenge. And something that I would like to learn how to do better, and the material never disappoints me.