Hingis celebrates with partner Chan Yung-jan, of Taiwan, after winning the US Open. Julie Jacobson / AP Photo
Few people knew Martina Hingis when she played at the US Open in 1996. Shaun Botterill / Getty Images
But the way she played at the Australian Open in 1997 was a revelation. Mark Sandten / Getty Images
In fact she became the youngest ever major singles winner at the Australian Open. She was only 16. Clive Brunskill / Getty Images
By 1999 she had become the best player in tennis, collecting trophies along the way, including the German Open. Elisenda Roig / Getty Images
In June 1999, she lost her second French Open final. This time it was to Germany's Steffi Graf, who made a dramatic comeback to win 4-6, 7-5, 6-2. Getty Images
The 'Swiss Miss' was still a force to be reckoned with in 2000, but she could not win the Australian Open. Frank Peters / Getty Images
Hingis also played in the UAE. Here she is seen in action against Maria Sharapova of Russia at the Dubai Women's Championships in February, 2006. Cancan Chu / Getty Images
Comebacks proved to be a feature in Hingis's career. Not many fancied watching her play at the Australian Open in 2007. Clive Brunskill / Getty Images
She continued to win titles during her returns, such as the Toray Pan Pacific Tournament at Tokyo in 2007. Koichi Kamoshida / Getty Images
Six years later, she reinvented herself as a doubles player. Here she is involved in a legends game with Martina Navratilova at the Australian Open. Michael Dodge / Getty Images
She won one of her mixed doubles titles - the Australian Open in 2015 - in partnership with India's Leander Paes. Robert Prezioso / Getty Images
She struck up a bond with another Indian player - Sania Mirza - in the doubles. Here they are plotting a point at Wuhan, China. Zhong Zhi / Getty Images
Hingis won the Australian Open women's doubles title with Mirza. Scott Barbour / Getty Images
She also represented Switzerland at the Olympics. She and Timea Bacsinszky, left, were beaten by Ekaterina Makarova and Elena Vesnina of Russia at the 2016 Games in Rio de Janeiro. Laurent Gillieron / EPA
She teamed up with British player Jamie Murray at Wimbledon this year - and won. Peter Klaunzer / EPA
Hingis celebrates with partner Chan Yung-jan, of Taiwan, after winning the US Open. Julie Jacobson / AP Photo
Few people knew Martina Hingis when she played at the US Open in 1996. Shaun Botterill / Getty Images
But the way she played at the Australian Open in 1997 was a revelation. Mark Sandten / Getty Images
In fact she became the youngest ever major singles winner at the Australian Open. She was only 16. Clive Brunskill / Getty Images
By 1999 she had become the best player in tennis, collecting trophies along the way, including the German Open. Elisenda Roig / Getty Images
In June 1999, she lost her second French Open final. This time it was to Germany's Steffi Graf, who made a dramatic comeback to win 4-6, 7-5, 6-2. Getty Images
The 'Swiss Miss' was still a force to be reckoned with in 2000, but she could not win the Australian Open. Frank Peters / Getty Images
Hingis also played in the UAE. Here she is seen in action against Maria Sharapova of Russia at the Dubai Women's Championships in February, 2006. Cancan Chu / Getty Images
Comebacks proved to be a feature in Hingis's career. Not many fancied watching her play at the Australian Open in 2007. Clive Brunskill / Getty Images
She continued to win titles during her returns, such as the Toray Pan Pacific Tournament at Tokyo in 2007. Koichi Kamoshida / Getty Images
Six years later, she reinvented herself as a doubles player. Here she is involved in a legends game with Martina Navratilova at the Australian Open. Michael Dodge / Getty Images
She won one of her mixed doubles titles - the Australian Open in 2015 - in partnership with India's Leander Paes. Robert Prezioso / Getty Images
She struck up a bond with another Indian player - Sania Mirza - in the doubles. Here they are plotting a point at Wuhan, China. Zhong Zhi / Getty Images
Hingis won the Australian Open women's doubles title with Mirza. Scott Barbour / Getty Images
She also represented Switzerland at the Olympics. She and Timea Bacsinszky, left, were beaten by Ekaterina Makarova and Elena Vesnina of Russia at the 2016 Games in Rio de Janeiro. Laurent Gillieron / EPA
She teamed up with British player Jamie Murray at Wimbledon this year - and won. Peter Klaunzer / EPA
Hingis celebrates with partner Chan Yung-jan, of Taiwan, after winning the US Open. Julie Jacobson / AP Photo
