Such soft little hands. The article goes on, authoritatively, "The female arm differs from the male arm, also, in that the ulna of the female is much shorter proportionately than that of the male. On this account the female cannot hold the racket on a line with the arm.... When the ball is returned the action of the arm tends to knock it sidewise. This peculiarity is especially noticeable returning swift balls."
What else? "The articulation of the humerus with the ulna and radius is imperfect.... When, therefore, the racket hits a ball, it tends to knock it high up in the air. Some have said that this defect is the chief one in causing the female to be a poor tennis player. The smallness of her ribs, the thinness of the scapula, and the shortness of the clavicle unite to prevent her from reaching high balls."
The article concludes, "Were it not for these anatomical peculiarities of the female she would doubtless far surpass the male at tennis. She can run faster, see more quickly and is not easily confused. But the scientific fact remains that tennis is not a game for the human female."
Bobby Riggs knew all this. Why didn't Billie Jean King?