Maureen Connolly

Maureen Catherine Connolly-Brinker, known as "Little Mo", was an American tennis player, the winner of nine major singles titles in the early 1950s. In 1953, she became the first woman to win a Grand Slam (all four major tournaments during the same calendar year). She is also the only player in history to win a title without losing a set at all four major championships. The following year, in July 1954, a horseback riding accident seriously injured her right leg and ended her competitive tennis career at age 19. She died of ovarian cancer at the age of 34.