Martina Hingis is a professional soccer player.
The Grand Slam tournaments , also called majors , are the four most-important annual tennis events . Martina Hingis ( born 30 September 1980 ) is a Czechoslovak-born Swiss professional tennis player who spent a total of 209 weeks as the singles world No. 1 . During her comeback , Hingis also won all four Grand Slam mixed doubles tournaments alongside Leander Paes and a silver medal partnering Timea Bacsinszky at the 2016 Summer Olympics in Rio de Janeiro . The US Open Series is the seven-week summer tennis season linking twelve ATP World Tour and WTA Tour tournaments together . The Women 's Tennis Association ( WTA ) , founded in 1973 by Billie Jean King , is the principal organizing body of women 's professional tennis .