Castillo has best change up in MLB

[grampahol]

I meet Fred Norman at one of those camps and he was showing how to throw a screw ball then added, "Don't try this kids. It'll screw up your arm." Of course I didn't listen to the last part and learned to throw the screw ball and it does leave you with an aching arm for awhile after throwing it a few times..  It was still my out pitch when I needed it. Some call it a backward curve, but it does stress the muscles and ligaments.. Always fun to see hitters look silly trying to hit it when it works though..