Martina Navratilova - After losing to Evert in the semifinals of that year's US Open, the 18-year-old Navratilova went to the offices of the Immigration and Naturalization Service in New York City and informed them that she wished to defect from Communist Czechoslovakia. Within a month, she received a green card.
Martina Navratilova is the most famous female tennis player of all time. Defecting to the US from communist Czechoslavakia at just 18, Navratilova came out in 1981, supporting gay rights and animal welfare, and later raised awareness of cancer. She powered through 18 Grand Slam single titles, including a record nine Wimbledon singles victories, and 31 doubles titles.