Matsuzaka says he can be even better than he's already been. ‘‘I wouldn’t say that I’m satisfied with any one particular thing,’’ Matsuzaka said when asked to assess his performance, ‘‘but at the very least, I can say that I’ve been able to stay healthy and maintain my spot in the rotation without missing any starts so far. Dissatisfied? I think I still feel I haven’t really pitched the way I’d like to yet.’’