Premise: Maria Sharapova . A United States resident since 1994 , Sharapova has competed on the WTA tour since 2001 . The Women 's Tennis Association ( WTA ) , founded in 1973 by Billie Jean King , is the principal organizing body of women 's professional tennis .
Hypothesis: In 2001, Maria Sharapova became a member of the Women's Tennis Association.
Label: NEUTRAL