Martina Navratilova is a retired Czech and American tennis player and coach. Billie Jean King, former World No. 1 player, said in 2006 that Navratilova is "the greatest singles, doubles and mixed doubles player who's ever lived."
Navratilova was World No. 1 for a total of 332 weeks in singles, and a record 237 weeks in doubles, making her the only player in history to have held the top spot in both singles and doubles for over 200 weeks. She was year-end singles No. 1 seven times, including a record 5 consecutive years, as well as year-end doubles No. 1 five times, including three consecutive years during which she held the ranking for the entire year. She won 18 Grand Slam singles titles, 31 major women's doubles titles, and 10 major mixed doubles titles. She reached the Wimbledon singles final 12 times, including nine consecutive years from 1982 through 1990, and won the women's singles title at Wimbledon a record nine times. She and King each won 20 Wimbledon titles, an all-time record. Navratilova is one of just three women to have accomplished a career Grand Slam in singles, women's doubles, and mixed doubles a record she shares with Margaret Court and Doris Hart. She holds the open era record for most singles titles and doubles titles. She recorded the longest winning streak in the open era and three of the six longest winning streaks in the women's open era. Navratilova, Margaret Court and Maureen Connolly share the record for the most consecutive major singles titles. Navratilova reached 11 consecutive major singles finals, second all-time to Steffi Graf's 13. In women's doubles, Navratilova and Pam Shriver won 109 consecutive matches and won all four major titles in 1984, i.e. the Grand Slam. Also the pair set an all-time record of 79 titles together and tied Louise Brough Clapp's and Margaret Osborne duPont's record of 20 major women's doubles titles as a team. In addition she won the season ending WTA Tour Championships a record 8 times and made the finals a record 14 times and won the doubles title a record 11 times. Navratilova is the only person of either sex to have won eight different tournaments at least seven times. Navratilova is one of only five tennis players all-time to win a multiple slam set in two disciplines, matching Margaret Court, Roy Emerson, Frank Sedgman and Serena Williams.