Kirsten Flipkens of Belgium in action against Ana Ivanovic of Serbia during their match of the International Premier Tennis League (IPTL) in Singapore, 04 December 2014. The IPTL, which features four teams made out of a hybrid mix of current and former men’s and women’s players, is on its second leg in Singapore, after starting in the Phillipines, and will continue in New Delhi and conclude in Dubai. EPA/WALLACE WOON

Gael Monfils of France in action against Andy Murray of Britain during their match at the first leg of International Tennis Premier League (IPTL) at the Mall of Asia Arena in Pasay city, south of Manila, Philippines, 29 November 2014. EPA/RITCHIE B. TONGO

Andy Murray of Great Britain in action against Nick Kyrgios of Australia (unseen) during the first leg of International Tennis Premier League (IPTL) at the Mall of Asia Arena in Pasay city, south of Manila, Philippines, 30 November 2014. EPA/RITCHIE B. TONGO

Ana Ivanovic of Serbia in action against Kirsten Flipkens of Belgium during their match of the International Premier Tennis League (IPTL) in Singapore, 04 December 2014. The IPTL, which features four teams made out of a hybrid mix of current and former men’s and women’s players, is on its second leg in Singapore, after starting in the Phillipines, and will continue in New Delhi and conclude in Dubai. EPA/WALLACE WOON

Sania Mirza of India plays with her racquet during the mixed doubles against Daniela Hantuchova of Slovakia and Bruno Soares of Brazil (unseen) at the first leg of International Tennis Premier League (IPTL) at the Mall of Asia Arena in Pasay city, south of Manila, Philippines, 28 November 2014. The tennis travelling circus will begin its run in the Philippines, with Andy Murray signed to play three matches for the Manila Mavericks before bolting for the US and a regular December training block in Miami. The IPTL, a hybrid mix of current and former men’s and women’s players with a few legends tossed into the pool, also fields squads in India, Singapore and Dubai. The Manila weekend is billed as the biggest tennis event in the country since a 1989 exhibition between Bjorn Borg and John McEnroe. EPA/JAY LABRA

Roger Federer of Indian in action against Singapore Slammers player Tomas Berdych during their men’s singles match of the the International Premier Tennis League (IPTL) in New Delhi, India on 07 December 2014. The league features four teams made out of a hybrid mix of current and former men’s and women’s players. EPA/MONEY SHARMA