This enlightening book compares the lives and careers of four great women's tennis players: Serena Williams, Venus Williams, Maria Sharapova and Martina Navratilova. Each of these women is a legend, but which of these on-court superstars is the GOAT, or the greatest of all time? Using basic math and analytical principles, readers will learn to sort out what makes each of these four great champions unique and to draw conclusions about their relative abilities. Among the statistics that will be considered are career wins, grand slam victories, percentage of games and sets won, and head-to-head matchups.