Worried? Sure. There's some potential there for problems. But the pitches he's throwing - 97 mph Fastball, changeup, and forkball - aren't that stressful on the ligaments. And his gyroball slider? It's designed not to induce stress on the elbow and wrist ligaments.

Matsuzaka is a risk, no doubt, but he's still young, and, considering that he'd be pitching considerably less in American than he would be in Japan, should be alright. Anybody can be a risk - you mentioned Kerry Wood - but if it pays off, then the Yanks have a bonifide ace on their hands. And if it doesn't? The Yanks still have those giant purse strings...