One of the greatests champions ever. She won the most Majors in Singles and Doubles. So we just may compare her with the best of the best: Graf, Navratilova, Evert.
But: in my opinion there is a Big "but": The most of her Major-Titles she won at the Australian Open, which were not a real international tournament that time. She won the Grand Slam - but three of four tournaments were played on grass courts. So even if she won two more Major-titles in my feeling Graf lays in front...
