It might be nothing, of course. And I don't wish him ill; he is so good, it is a pleasure to watch such an incredible athlete. The Nationals have done everything they could to bring him along slowly. Maybe men are just not supposed to throw a baseball this hard, and still have such a great curve, changeup, and slider. (J/K on that last sentence)
http://sportsillustrated.cnn.com/201...mri/index.html