Suzanne Lenglen and Helen Wills Moody were the first 2 truly dominant Champions of womens tennis. Suzanne Lenglen lost only a single match from 1919 to 1926, and it was a default while trailing Molla Mollarey 2-6, 0-30 in a second round match of the U.S Open. Helen Wills only lost a single match from 1927 to 1933, a final round retirement while trailing 0-3 in the final set to longtime rival Helen Jacobs. They played each other in one match, in Cannes in 1926 with Lenglen winning 6-3, 8-6. From what I am aware of Wills Moody was the one who introduced the power game, hitting with devasting pace, depth, and precision off both forehand and backhand, as well as serving hard for the time. Lenglen had the beautiful all court court, and was an extremely fluid and graceful player.