B.J. Ryan won't pitch in the WBC:

Ryan on Monday cited concerns about his mechanics and becomes the third relief pitcher in the last 24 hours to announce that he will miss at least the first round of the tournament. Minnesota's Joe Nathan pulled out entirely on Sunday, while Angels closer Brian Fuentes said he will miss the first set of games.

Most of the other players I've seen say no offered pretty good reasons, usually recovery from injuries or their teams simply said no. If Ryan's mechanics are off, is that a sign of something deeper?