Davenport ended an 80-week stretch Hingis had enjoyed as the No.
1 singles player in October 1998, but Hingis finished the year by beating Davenport in the final of the WTA Tour Championships.
6, winning two Tier I tournaments, and also receiving the Laureus World Sports Award for Comeback of the Year.She retired in November 2007, after being hampered by a hip injury for several months and testing positive for a metabolite of cocaine during the 2007 Wimbledon Championships, which led to a two-year suspension from the sport.In 1998, Hingis won all four of the Grand Slam women's doubles titles, only the fourth in women's tennis history to do so, (the Australian Open with Mirjana Lučić and the other three events with Novotná), and she became only the third woman to hold the No.1 ranking in both singles and doubles simultaneously.Later, Hingis and Mary Pierce, her new doubles partner, lost to Lisa Raymond and Rennae Stubbs.
Hingis captured the French Open women's doubles title with Pierce and produced consistent results in singles tournaments throughout the year.She also retained her Australian Open singles title by beating Conchita Martínez in straight sets in the final.Hingis, however, lost in the final of the US Open to Lindsay Davenport.She then reached the French Open final and was three points away from victory in the second set before losing to Steffi Graf about whom she had said before: "Steffi had some results in the past, but it's a faster, more athletic game now... Her time has passed." She broke into tears after a game in which the crowd had booed her for using underhand serves and crossing the line in a discussion about an umpire decision.Hingis bounced back to reach her third consecutive US Open final, where she lost to 17-year-old Serena Williams.2001 was her least successful year in several seasons, with only three tournament victories in total. 1 ranking for the last time (to Jennifer Capriati) on 14 October 2001.