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World No.1 Roger Federer of Switzerland competes against Rafael Nadal of Spain during a semi-final match of the Tennis Masters Cup Shanghai 2007 in Sh Stock Photo - Alamy
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Roger Federer of Switzerland celebrates after defeating Daniil Medvedev of Russia in their second round match of the men's singles during the Rolex Sh Stock Photo - Alamy
![Martina Hingis (L) of Switzerland and Sania Mirza of India show off their trophy after defeating Casey Dellacqua of Australia and Yaroslava Shvedova of Kazakhstan in the woman's double final match at Martina Hingis (L) of Switzerland and Sania Mirza of India show off their trophy after defeating Casey Dellacqua of Australia and Yaroslava Shvedova of Kazakhstan in the woman's double final match at](https://c8.alamy.com/comp/TYR0XP/martina-hingis-l-of-switzerland-and-sania-mirza-of-india-show-off-their-trophy-after-defeating-casey-dellacqua-of-australia-and-yaroslava-shvedova-of-kazakhstan-in-the-womans-double-final-match-at-arthur-ashe-stadium-during-the-us-open-tennis-championships-at-the-usta-billie-jean-king-national-tennis-center-in-new-york-city-on-september-13-2015-hingis-and-mirza-won-6-3-6-3-photo-by-monika-graffupi-TYR0XP.jpg)
Martina Hingis (L) of Switzerland and Sania Mirza of India show off their trophy after defeating Casey Dellacqua of Australia and Yaroslava Shvedova of Kazakhstan in the woman's double final match at
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Rafael Nadal of Spain competes against world No.1 Roger Federer of Switzerland during a semi-final match of the Tennis Masters Cup Shanghai 2007 in Sh Stock Photo - Alamy
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Martina Hingis of Switzerland chases down a return with playing partner Sania Mirza of India (L) as they face Casey Dellacqua of Australia and Yaroslava Shvedova of Kazakhstan in the women's doubles
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