![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 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](https://c8.alamy.com/comp/W9HCH8/rafael-nadal-of-spain-competes-against-world-no1-roger-federer-of-switzerland-during-a-semi-final-match-of-the-tennis-masters-cup-shanghai-2007-in-sh-W9HCH8.jpg)
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
![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 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](https://c8.alamy.com/comp/W622EE/roger-federer-of-switzerland-celebrates-after-defeating-daniil-medvedev-of-russia-in-their-second-round-match-of-the-mens-singles-during-the-rolex-sh-W622EE.jpg)
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
![Roger Federer of Switzerland wipes off sweat as he competes against Borna Coric of Croatia in their men's singles semi-final match during the Rolex Sh Stock Photo - Alamy Roger Federer of Switzerland wipes off sweat as he competes against Borna Coric of Croatia in their men's singles semi-final match during the Rolex Sh Stock Photo - Alamy](https://c8.alamy.com/comp/W621P4/roger-federer-of-switzerland-wipes-off-sweat-as-he-competes-against-borna-coric-of-croatia-in-their-mens-singles-semi-final-match-during-the-rolex-sh-W621P4.jpg)
Roger Federer of Switzerland wipes off sweat as he competes against Borna Coric of Croatia in their men's singles semi-final match during the Rolex Sh Stock Photo - Alamy
![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 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](https://c8.alamy.com/comp/2CJ2WNR/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-womens-doubles-final-match-at-the-us-open-championships-tennis-tournament-in-new-york-september-13-2015-reuterscarlo-allegri-2CJ2WNR.jpg)