Joe Sheehan from Baseball Analysts writes this great piece about keeping the ball on the ground.  He notes two things:

"...What was a little surprising to me is how the groundball percentage of every pitch decreases at almost the same rate with increasing height."

And that sinkers have a "...huge advantage... in generating grounders compared to any other pitch. "

Best part about a sinker?  It won't wreck a young arm, because you don't twist your wrist.  Here's how Jake Westbrook does it.

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