Every nation or tribe has a favorite sport in which its people often have more interest than they do in the many more serious vocations of life. The Americans, therefore, being no different from other peoples, have their own particular national sport—the American game of baseball. It has been my good fortune to study our pastime from many angles—as a player, as a fan and as a physician who has endeavored to rehabilitate or advise professional and amateur players. Of all the members of a ball team, the pitcher is the hero and the player on whom most depends. On many occasions I have been asked to designate the type of shoulder lesion that is disabling to the professional baseball pitcher. My answer has always been that the professional pitcher is subject to all the disabilities of the shoulder to which the average person is, namely subacromial and subdeltoid bursitis,