Martina Navratilova

Martina Navratilova revolutionized women's tennis with her serve-and-volley game, winning 18 Grand Slam singles titles and a record 31 Grand Slam doubles championships. Her nine Wimbledon singles titles between 1978 and 1990 are more than any other woman in history, outperforming Chris Evert's three. Ranked No.1 for 332 weeks, she also holds the mark for oldest major winner at 30 years, 7 months.