Watched Perdomo in the low-leverage blowout situation last night (Tues 9/4) in Chicago. You can see why the Twins are intrigued: His arm motion is a whip style delivery similar to Matt Guerrier, except that Perdomo's arm slot is more 3/4's overhand. Great potential for easy velocity, but Perdomo last night struggled to get his motion synchronized, so his pitches were semi-wild.
What puzzles me is why more pitchers and pitching coaches don't break down the few old films of Walter Johnson, the best example ever of the whip-style delivery. Johnson himself was only 6'1", 200 pounds, but he did have very long arms, and the few videos I've seen of him were clearly intended to show how he threw a baseball. I think a lot of people see where WJ got his easy velocity, but they miss where he got his pinpoint accuracy - the long control moment where the palm of his pitching hand traveled towards his target as if it were guided by a long string.
Most pitchers seem to concentrate on getting a tight snap, bending their elbow to the max. Johnson actually didn't bend his elbow that much, about 90 degrees, and the palm of his hand during the second stage of the whip was thrusting from in front of and just below his rotator cuff. From this position he could avoid injuring his elbow and his rotator, while guiding the ball to target with a smooth motion. WJ's finish was a lesson in relaxed balance - palm down, elbow slightly bent, back knee next to stride knee indicates linear transfer of weight for a tight upper body rotation over the front leg, also adding to his accuracy. No wonder this guy could spot the ball within inches. There was zero round-house in his stride. As a side-armer, he had natural control of the vertical. With a linear stride, he controlled the horizontal. Bull's eye.
In contrast, Perdomo's delivery changes the natural plane of the whip from sidearm to 3/4s overhand, and he bends his elbow farther to add snap. Problem is, when to snap? Unlike WJ's delivery, Perdomo's is extremely timing sensitive. His control moment is compressed to a few inches, where WJ's is about a foot and a half. The longer arrow is naturally more accurate. Funny thing is, Perdomo could alter his motion to more like WJ's in about half an hour. What would take longer is to match WJ's perfect balance. Jump rope? Trampoline? Balance beam?
By the way, I was watching Humber get pounded, and he was tipping his pitches. Standing on the mound, he was leaning towards the side of the plate he was going to throw to. Think the Twins hitters noticed?
Edited by jimbo92107, 05 September 2012 - 09:20 AM.