Martina Hingis is a Swiss former professional tennis player. She was ranked as the world No. 1 in women's singles by the Women's Tennis Association (WTA) for 209 weeks and as the world No. 1 in women's doubles for 90 weeks, holding both No. 1 rankings simultaneously for 29 weeks. Hingis won 43 WTA Tour-level singles titles and 64 doubles titles, including a total of 25 major titles: five in singles, 13 in women's doubles, and seven in mixed doubles. In addition, she won the season-ending Tour Finals two times in singles and three in doubles, an Olympic silver medal in doubles, and a record 17 Tier I singles titles. WTA world No. 1 from February 8, 1999 to July 4, 1999 — 21 weeks. Wiki link