Martina Hingis
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Martina Hingis (born September 30, 1980) is a Swiss tennis professional and former World Number 1 player. She is also known as the "Swiss Miss". She has won five Grand Slam singles titles, three at the Australian Open (1997 to 1999), one at Wimbledon (1997) and one at the U.S. Open (1997). She is also a dominant player in doubles, winning nine Grand Slam doubles titles.
Hingis has retired twice from the game. The first time was in 2002, when she was struggling with injuries and was only 22. She returned to tennis in 2005, but retired two years later after sustaining more injuries. A blood test had also proved that she was using cocaine, an illegal drug.