Martina Navratilova is an athlete.
The 1975 Federation Cup was the 13th edition of the most important competition between national teams in women 's tennis . The Grand Slam tournaments , also called majors , are the four most-important annual tennis events . Martina Navratilova . In women 's doubles , Navratilova and Pam Shriver won 109 consecutive matches and won all four major titles -- the Grand Slam -- in 1984 .