Better known and more admired in the 1920s and '30s than any politician, movie star, or royal family member, Suzanne Lenglen, lionized by Frenchmen as "The Goddess," and Helen Wills, called "Queen Helen" or simply "The American Girl," revolutionized tennis with their power and grace and beauty, and in the process virtually invented the concept of celebrity athlete. This superb dual biography--the first of either player to appear in English--follows...