Martina Hingis plays tennis.
The 1998 Fed Cup was the 36th edition of the most important competition between national teams in women 's tennis . 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 . After achieving moderate success in 2014 playing with Sabine Lisicki and Flavia Pennetta , she partnered with Sania Mirza in March 2015 ; together they won three consecutive Grand Slam titles . Sabine Katharina Lisicki ( [ zaˈbɪnə lɪˈzɪki ] ; born 22 September 1989 ) is a German professional tennis player . The US Open Series is the seven-week summer tennis season linking twelve ATP World Tour and WTA Tour tournaments together .