This article by Geoff Baker is one of his best ever, which is saying quite a bit.  Far beyond a simple interview with Zduriencik, Baker gives a Ground Zero look into the way a real-world GM and manager sort out roster decisions.  

Dr. D gets a bit weary sometimes of the bloggers who condescend from behind their monitors that "Wedge is a terrible talent evaluator" when, in fact, every talent evaluation that the Seattle Mariners make represents the combined expertise of dozens of people.  In the Mariners' case right now, many of those people are the best in the business at what they do.

Yes, Iwakuma had adjustments to make from where he was in Spring Training.  He also has a long, impressive career as a #1 starting pitcher, and those adjustments are falling into place.

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On May 7th, Hisashi Iwakuma executed the pitches that made him a World Baseball Classic star, and champion, for Team Japan.  Here's the graphic comparison to typical MLB (TM) pitches:

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Everything below the horizontal X-axis is dropping farther than it would due to gravity alone - in other words, the pitch has enough topspin that the aerodynamics are pulling the ball toward the ground as it arrives at home plate.  Fastballs have so much backspin that they "rise" in the air as they approach the hitter, but of course hitters are accustomed to a 5-8" rise.  To them it doesn't look like rise; 5 to 8" rise looks straight.  Anything other than 5-8" rise will appear to them as sail or drop.

Every major league pitcher* can topspin a curve ball to make it break down a bit relative to vacuum.  But their forearms are tilted, right?  The hand makes a karate-chop type motion on a plane with the forearm, which is why the slider and curve, above, move on about the same plane as Iwakuma's forearm.

Nobody has ever explained to me what a pitcher does, physically, to create topspin at the same time as creating a side-spin that is 45 degrees oblique to the pitcher's forearm.  The red star is the Japanese "shuuto," a pitch that right hand batters cannot hit.  If they're lucky, they foul it into their feet.  It's a big reason that MLB All-Star teams cannot beat Japanese teams.

Here's a Brooks representation of the movement on each pitch type Monday night:

foul - most Japanese pitchers need to learn an enhanced sense of danger in the American League, as many NL pitchers do.

SLIDER - He threw 13 of these two-plane sliders, with about half a baseball's worth of extra drop and sideways break.  Of these 13 sliders, guess how many were strikes?  Hint:  11.  Of those 11 sliders thrown for strikes, guess how many were not put in play?  Hint:  10.  Call me when you see that again.

CHANGE CURVE - Iwakuma's curve ball broke harder than most MLB curves.  He threw 4, of which 3 were strikes - none in play.  

BOOK - The success of the slider and curve tell you what the book is on Mr. WBC-san.  Get a fastball in a good hitting zone and punish him.  The hitters are sitting so dead-red that any pitch other than fastball is an automatic strike.

The solution is simple:  slider for strike one, and make sure that the fastball does not miss out over the plate. 

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The light use is doing wonders for Iwakuma's arm and for his stuff.  And oh by the way Cubby, Iwakuma is the pitcher they could showcase, these next few months, in order to bring back trade bounty in July.  Not Kevin Millwood.