Tennis - WTA Tour Finals - Singapore Indoor Stadium, Singapore - October 29, 2017. Switzerland's Martina Hingis with Chan Yung-Jan, Iva Majoli and Mary Pierce. REUTERS/Jeremy Lee 

Tennis - WTA Tour Finals - Singapore Indoor Stadium, Singapore - October 29, 2017. Switzerland's Martina Hingis with Chan Yung-Jan, Iva Majoli and Mary Pierce. REUTERS/Edgar Su 

Tennis - WTA Tour Finals - Singapore Indoor Stadium, Singapore - October 29, 2017. Switzerland's Martina Hingis is presented with gifts from CEO Of The WTA, Steve Simon. REUTERS/Edgar Su 

Tennis - WTA Tour Finals - Singapore Indoor Stadium, Singapore - October 29, 2017. Switzerland's Martina Hingis. REUTERS/Edgar Su 

Tennis - WTA Tour Finals - Singapore Indoor Stadium, Singapore - October 28, 2017 Switzerland's Martina Hingis during during a press conference REUTERS/Jeremy Lee 

Tennis - WTA Tour Finals - Singapore Indoor Stadium, Singapore - October 28, 2017 Switzerland's Martina Hingis during during a press conference REUTERS/Jeremy Lee 

Tennis - WTA Tour Finals - Singapore Indoor Stadium, Singapore - October 28, 2017 Switzerland's Martina Hingis during her Semi Finals doubles match REUTERS/Jeremy Lee 

Tennis - WTA Tour Finals - Singapore Indoor Stadium, Singapore - October 28, 2017 Switzerland's Martina Hingis during her Semi Finals doubles match REUTERS/Jeremy Lee 

Tennis - WTA Tour Finals - Singapore Indoor Stadium, Singapore - October 28, 2017 Switzerland's Martina Hingis after her Semi Finals doubles match REUTERS/Jeremy Lee 

Tennis - WTA Tour Finals - Singapore Indoor Stadium, Singapore - October 28, 2017 Switzerland's Martina Hingis in action during her Semi Finals doubles match REUTERS/Jeremy Lee 

Tennis - WTA Tour Finals - Singapore Indoor Stadium, Singapore - October 28, 2017 Switzerland's Martina Hingis during her Semi Finals doubles match REUTERS/Jeremy Lee 

Tennis - US Open - Womens Doubles Final - New York, U.S. - September 10, 2017 - Martina Hingis of Switzerland and Yung-Jan Chan of Taiwan embrace after their win against Lucie Hradecka of the Czech Republic and Katerina Siniakova of the Czech Republic. REUTERS/Andrew Kelly 

Tennis - US Open - Womens Doubles Final - New York, U.S. - September 10, 2017 - Martina Hingis of Switzerland and Yung-Jan Chan of Taiwan kiss trophy after their win against Lucie Hradecka of the Czech Republic and Katerina Siniakova of the Czech Republic. REUTERS/Andrew Kelly 

Tennis - US Open - Womens Doubles Final - New York, U.S. - September 10, 2017 - Martina Hingis of Switzerland and Yung-Jan Chan of Taiwan hold trophy after their win against Lucie Hradecka of the Czech Republic and Katerina Siniakova of the Czech Republic. REUTERS/Andrew Kelly 

Tennis - US Open - Womens Doubles Final - New York, U.S. - September 10, 2017 - Martina Hingis of Switzerland and Yung-Jan Chan of Taiwan kiss trophy after their win against Lucie Hradecka of the Czech Republic and Katerina Siniakova of the Czech Republic. REUTERS/Andrew Kelly 

Tennis - US Open - Womens Doubles Final - New York, U.S. - September 10, 2017 - Martina Hingis of Switzerland and Yung-Jan Chan of Taiwan celebrate their win against Lucie Hradecka of the Czech Republic and Katerina Siniakova of the Czech Republic. REUTERS/Mike Segar 

Tennis - US Open - Womens Doubles Final - New York, U.S. - September 10, 2017 - Martina Hingis of Switzerland and Yung-Jan Chan of Taiwan celebrate their win against Lucie Hradecka of the Czech Republic and Katerina Siniakova of the Czech Republic. REUTERS/Mike Segar 

Tennis - US Open - Womens Doubles Final - New York, U.S. - September 10, 2017 - Martina Hingis of Switzerland and Yung-Jan Chan of Taiwan celebrate their win against Lucie Hradecka of the Czech Republic and Katerina Siniakova of the Czech Republic. REUTERS/Mike Segar 

Tennis - US Open - Womens Doubles Final - New York, U.S. - September 10, 2017 - Martina Hingis of Switzerland and Yung-Jan Chan of Taiwan celebrate their win against Lucie Hradecka of the Czech Republic and Katerina Siniakova of the Czech Republic. REUTERS/Andrew Kelly 

Tennis - US Open - Womens Doubles Final - New York, U.S. - September 10, 2017 - Martina Hingis of Switzerland and Yung-Jan Chan of Taiwan celebrate their win against Lucie Hradecka of the Czech Republic and Katerina Siniakova of the Czech Republic. REUTERS/Andrew Kelly 

Tennis - US Open - Womens Doubles Final - New York, U.S. - September 10, 2017 - Martina Hingis of Switzerland and Yung-Jan Chan of Taiwan celebrate their win against Lucie Hradecka of the Czech Republic and Katerina Siniakova of the Czech Republic. REUTERS/Andrew Kelly 

Tennis - US Open - Womens Doubles Final - New York, U.S. - September 10, 2017 - Martina Hingis of Switzerland and Yung-Jan Chan of Taiwan celebrate their win against Lucie Hradecka of the Czech Republic and Katerina Siniakova of the Czech Republic. REUTERS/Andrew Kelly 

Tennis - US Open - Mixed Doubles Final - New York, U.S. - September 9, 2017 - Finalists Hao-Ching Chan of Taiwan and Michael Venus of New Zealand hold runners-up trophy after loss to Martina Hingis of Switzerland and Jamie Murray of England. REUTERS/Andrew Kelly 

Tennis - US Open - Mixed Doubles Final - New York, U.S. - September 9, 2017 - Champions Martina Hingis of Switzerland and Jamie Murray of England with finalists Hao-Ching Chan of Taiwan and Michael Venus of New Zealand. REUTERS/Andrew Kelly 

Tennis - US Open - Mixed Doubles Final - New York, U.S. - September 9, 2017 - Champions Martina Hingis of Switzerland and Jamie Murray of England celebrate defeating Hao-Ching Chan of Taiwan and Michael Venus of New Zealand. REUTERS/Andrew Kelly 

Tennis - US Open - Mixed Doubles Final - New York, U.S. - September 9, 2017 - Champions Martina Hingis of Switzerland and Jamie Murray of England celebrate defeating Hao-Ching Chan of Taiwan and Michael Venus of New Zealand. REUTERS/Andrew Kelly 

Tennis - US Open - Mixed Doubles Final - New York, U.S. - September 9, 2017 - Champions Martina Hingis of Switzerland and Jamie Murray of England celebrate defeating Hao-Ching Chan of Taiwan and Michael Venus of New Zealand. REUTERS/Andrew Kelly 

Tennis - US Open - Mixed Doubles Final - New York, U.S. - September 9, 2017 - Champions Martina Hingis of Switzerland and Jamie Murray of England hold trophy after defeating Hao-Ching Chan of Taiwan and Michael Venus of New Zealand. REUTERS/Andrew Kelly 

Tennis - US Open - Mixed Doubles Final - New York, U.S. - September 9, 2017 - Champions Martina Hingis of Switzerland and Jamie Murray of England hold trophy after defeating Hao-Ching Chan of Taiwan and Michael Venus of New Zealand. REUTERS/Andrew Kelly 

Tennis - US Open - Mixed Doubles Final - New York, U.S. - September 9, 2017 - Champions Martina Hingis of Switzerland and Jamie Murray of England hold trophy after defeating Hao-Ching Chan of Taiwan and Michael Venus of New Zealand. REUTERS/Andrew Kelly 

Tennis - Wimbledon - London, Britain - July 16, 2017 Finland’s Henri Kontinen and Great Britain’s Heather Watson pose with their runner up trophies after losing their mixed doubles final against Great Britain’s Jamie Murray and Switzerland’s Martina Hingis REUTERS/Andrew Couldridge 

Tennis - Wimbledon - London, Britain - July 16, 2017 Great Britain’s Jamie Murray and Switzerland’s Martina Hingis pose as they celebrate with their trophies after winning the mixed doubles final against Finland’s Henri Kontinen and Great Britain’s Heather Watson REUTERS/Andrew Couldridge 

Tennis - Wimbledon - London, Britain - July 16, 2017 Great Britain’s Jamie Murray and Switzerland’s Martina Hingis pose as they celebrate with their trophies after winning the mixed doubles final against Finland’s Henri Kontinen and Great Britain’s Heather Watson REUTERS/Andrew Couldridge 

Tennis - Wimbledon - London, Britain - July 16, 2017 Great Britain’s Jamie Murray and Switzerland’s Martina Hingis pose as they celebrate with their trophies after winning the mixed doubles final against Finland’s Henri Kontinen and Great Britain’s Heather Watson REUTERS/Andrew Couldridge 

Tennis - Wimbledon - London, Britain - July 16, 2017 Great Britain’s Jamie Murray and Switzerland’s Martina Hingis celebrate with their trophies after winning the mixed doubles final against Finland’s Henri Kontinen and Great Britain’s Heather Watson REUTERS/Andrew Couldridge 

Tennis - Wimbledon - London, Britain - July 16, 2017 Great Britain’s Jamie Murray and Switzerland’s Martina Hingis celebrate winning the mixed doubles final against Finland’s Henri Kontinen and Great Britain’s Heather Watson REUTERS/Toby Melville 

Tennis - Wimbledon - London, Britain - July 16, 2017 Great Britain’s Jamie Murray and Switzerland’s Martina Hingis celebrate winning the mixed doubles final against Finland’s Henri Kontinen and Great Britain’s Heather Watson REUTERS/Toby Melville 

Tennis - Wimbledon - London, Britain - July 16, 2017 Great Britain’s Jamie Murray and Switzerland’s Martina Hingis with Finland’s Henri Kontinen and Great Britain’s Heather Watson after winning the mixed doubles final REUTERS/Toby Melville 

Tennis - Wimbledon - London, Britain - July 16, 2017 Great Britain’s Jamie Murray and Switzerland’s Martina Hingis celebrate winning the mixed doubles final against Finland’s Henri Kontinen and Great Britain’s Heather Watson REUTERS/Toby Melville 

Tennis - Wimbledon - London, Britain - July 16, 2017 Great Britain’s Jamie Murray and Switzerland’s Martina Hingis celebrate winning the mixed doubles final against Finland’s Henri Kontinen and Great Britain’s Heather Watson REUTERS/Toby Melville 

Tennis - Wimbledon - London, Britain - July 16, 2017 Great Britain’s Jamie Murray and Switzerland’s Martina Hingis in action during the mixed doubles final against Finland’s Henri Kontinen and Great Britain’s Heather Watson REUTERS/Andrew Couldridge 

Tennis - Wimbledon - London, Britain - July 16, 2017 Great Britain’s Jamie Murray and Switzerland’s Martina Hingis celebrate winning the mixed doubles final against Finland’s Henri Kontinen and Great Britain’s Heather Watson REUTERS/Andrew Couldridge 

Tennis - Wimbledon - London, Britain - July 16, 2017 Great Britain’s Jamie Murray and Switzerland’s Martina Hingis celebrate winning the mixed doubles final against Finland’s Henri Kontinen and Great Britain’s Heather Watson REUTERS/Andrew Couldridge 

Tennis - Wimbledon - London, Britain - July 16, 2017 Great Britain’s Jamie Murray and Switzerland’s Martina Hingis celebrate winning the mixed doubles final against Finland’s Henri Kontinen and Great Britain’s Heather Watson REUTERS/Andrew Couldridge 

Tennis - Wimbledon - London, Britain - July 16, 2017 Great Britain’s Jamie Murray and Switzerland’s Martina Hingis celebrate winning the mixed doubles final against Finland’s Henri Kontinen and Great Britain’s Heather Watson REUTERS/Andrew Couldridge 

Tennis - Wimbledon - London, Britain - July 16, 2017 Great Britain’s Jamie Murray and Switzerland’s Martina Hingis with Finland’s Henri Kontinen and Great Britain’s Heather Watson after winning the mixed doubles final REUTERS/Andrew Couldridge 

Tennis - Wimbledon - London, Britain - July 16, 2017 Great Britain’s Jamie Murray and Switzerland’s Martina Hingis celebrate winning the mixed doubles final against Finland’s Henri Kontinen and Great Britain’s Heather Watson REUTERS/Toby Melville 

Tennis - Wimbledon - London, Britain - July 16, 2017 Great Britain’s Jamie Murray and Switzerland’s Martina Hingis in action during their mixed doubles final against Finland’s Henri Kontinen and Great Britain’s Heather Watson REUTERS/Toby Melville 

Tennis - Wimbledon - London, Britain - July 16, 2017 Great Britain’s Jamie Murray and Switzerland’s Martina Hingis in action during their mixed doubles final against Finland’s Henri Kontinen and Great Britain’s Heather Watson REUTERS/Toby Melville 

Tennis - Wimbledon - London, Britain - July 16, 2017 Finland’s Henri Kontinen and Great Britain’s Heather Watson in action during their mixed doubles final against Great Britain’s Jamie Murray and Switzerland’s Martina Hingis REUTERS/Toby Melville 

Tennis - Wimbledon - London, Britain - July 16, 2017 Finland’s Henri Kontinen and Great Britain’s Heather Watson in action during their mixed doubles final against Great Britain’s Jamie Murray and Switzerland’s Martina Hingis REUTERS/Toby Melville 

Tennis - Wimbledon - London, Britain - July 16, 2017 Finland’s Henri Kontinen and Great Britain’s Heather Watson in action during their mixed doubles final against Great Britain’s Jamie Murray and Switzerland’s Martina Hingis REUTERS/Toby Melville 

Tennis - Wimbledon - London, Britain - July 16, 2017 Finland’s Henri Kontinen and Great Britain’s Heather Watson in action during their mixed doubles final against Great Britain’s Jamie Murray and Switzerland’s Martina Hingis REUTERS/Toby Melville 

Tennis - Wimbledon - London, Britain - July 16, 2017 Great Britain’s Jamie Murray and Switzerland’s Martina Hingis in action during their mixed doubles final against Finland’s Henri Kontinen and Great Britain’s Heather Watson REUTERS/Toby Melville 

Tennis - Wimbledon - London, Britain - July 16, 2017 Great Britain’s Jamie Murray and Switzerland’s Martina Hingis in action during their mixed doubles final against Finland’s Henri Kontinen and Great Britain’s Heather Watson REUTERS/Toby Melville 

Tennis - Wimbledon - London, Britain - July 16, 2017 Great Britain’s Jamie Murray and Switzerland’s Martina Hingis during their mixed doubles final against Finland’s Henri Kontinen and Great Britain’s Heather Watson REUTERS/Toby Melville 

Tennis - Wimbledon - London, Britain - July 16, 2017 Finland’s Henri Kontinen and Great Britain’s Heather Watson in action during their mixed doubles final against Great Britain’s Jamie Murray and Switzerland’s Martina Hingis REUTERS/Toby Melville 

Tennis - Wimbledon - London, Britain - July 16, 2017 Finland’s Henri Kontinen and Great Britain’s Heather Watson in action during their mixed doubles final against Great Britain’s Jamie Murray and Switzerland’s Martina Hingis REUTERS/Toby Melville 

Tennis - Wimbledon - London, Britain - July 16, 2017 Great Britain’s Jamie Murray and Switzerland’s Martina Hingis during their mixed doubles final against Finland’s Henri Kontinen and Great Britain’s Heather Watson REUTERS/Toby Melville 

Tennis - Wimbledon - London, Britain - July 16, 2017 Great Britain’s Jamie Murray and Switzerland’s Martina Hingis during their mixed doubles final against Finland’s Henri Kontinen and Great Britain’s Heather Watson REUTERS/Toby Melville