from Tom Verducci in Sports Illustrated:
"Here's the truth: Matsuzaka's changeup is so wicked, so unlike most every changeup anyone has seen, that people don't know what to make of it. Matsuzaka has told me he does not throw the gyroball. Every Red Sox staff member and official I've talked with said he does not throw it.
"What the Marlins thought was the gyro was the changeup," one of the Boston sources said. "That's what people think is the gyro. It's his best pitch."
Matsuzaka throws his changeup with a screwball action to it, including a bigger break than most such offspeed pitches. He also throws a harder two-seamer pitch with some sinking action and a slight left-to-right break -- the shuuto, which essentially is Japan's improved version of that two-seam fastball Greg Maddux starts at the hip of left-handed hitters and runs back over the inside corner.
Matsuzaka already has had conversations with catcher Jason Varitek about wanting to establish all of his pitches early in a game. What makes him especially difficult to solve is that he can break two pitches into a right-handed hitter at different speeds (changeup and shuuto) and three pitches (slider, cutter and curve) away from the right-hander at different speeds. He also has a nasty, downward-breaking splitter"
Looks like Jason Varitek will need a finger implant. There aren't enough at the moment for all the effective pitches Matsuzaka throws.