Martina Hingis is a professional soccer player.
The Grand Slam tournaments , also called majors , are the four most-important annual tennis events . Martina Hingis . In 2013 , Hingis was elected into the International Tennis Hall of Fame , and was appointed two years later the organization 's first ever Global Ambassador . The Women 's Tennis Association ( WTA ) , founded in 1973 by Billie Jean King , is the principal organizing body of women 's professional tennis .