How to throw a sinker

Most of the time, you'll want to throw a sinker with your fingers parallel with the seams. Sometimes, depending on finger pressure, it could be on one seam or it could be on the other seam.

A lot of guys throw a sinker off of the middle finger. The movement is down and late. It sinks, for a righthanded pitcher, into a righthander, and away from a lefthander.

For a lefthander, it's into a lefthander, away from a righthander.