Martina Navratilova is a person.
Martina Navratilova . She and Billie Jean King each won 20 Wimbledon titles , an all-time record . She and Serena Williams are the only Open Era players to have won six major singles crowns without the loss of a set . She was ranked in the world 's top 10 in singles for a record 20 consecutive years ( 1975 -- 1994 ) , a span which included 19 years in the top 5 , 15 years in the top 3 , and 7 years as the world No. 1 ranked singles player . Navratilova is regarded by some to be the greatest female tennis player of all time .