Premise: Martina Navratilova . Navratilova is one of just three women ever to have accomplished a Career Grand Slam in singles , women 's doubles , and mixed doubles ( called the Grand Slam `` boxed set '' ) , a distinction she shares with Margaret Court and Doris Hart . 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 . The WTA Finals ( formerly known as the WTA Tour Championships short : WTA Championships ) , is a professional tennis tournament played annually at the end of the season for the top-ranked players on the Women 's Tennis Association ( WTA ) tour .
Hypothesis: Martina Navratilova is a person.
Label: ENTAILMENT