
Graf rose to the top of women's tennis in 1987, ending Martina Navratilova's reign and seizing the No. 1 ranking. Her defining year was 1988, when she became the only player ever to win the Golden Slam: all four majors plus Olympic gold in a single calendar year. That season made her an all-time great.

Known for her ferocious inside-out forehand and blistering footwork, Graf dominated women's tennis from the late 1980s. She dethroned Martina Navratilova to claim the No. 1 ranking in 1987 and rarely relinquished it.
In 1988 Graf accomplished what no player before or since has done: she won the Australian Open, French Open, Wimbledon, and US Open, then added Olympic gold in Seoul. The feat is forever known as the Golden Slam.
Graf retired in 1999 with 22 major titles and a record 377 weeks at No. 1. She married Andre Agassi in 2001 and has devoted herself to charitable work, including her Children for Tomorrow foundation.
Portrait: Mark Henckel · CC BY-SA 2.0 · via Wikimedia Commons