Both Arthur Ashe and Billie Jean King used these phrases ("playing out of one's mind," or "over one's head") to describe their performances while winning tghe finals at Wimbledon in 1975. . . . The player loses himself in the action, continually breaki g the false limits placed on is potential. Awareness becomes acutely heightened, while analysis, anxiety and self-conscious thought are compoletly forgotten. Enjoyment is at a peak