Martina Hingis (born 30 September 1980 in Košice, Slovakia, then Czechoslovakia) is a Swiss professional tennis player who spent a total of 209 weeks as World No. 1. She is 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 a dominant player in doubles, winning 10 Grand Slam doubles titles and 3 mixed 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. In 2013, she returned to playing doubles and became a tennis coach. She won the 2015 Wimbledon doubles title together with Sania Mirza, 19 years after winning her first Wimbledon doubles title in 1996.