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Switzerland's Roger Federer waves to the crowd at the end of his Men's single tennis match against Serbia's Novak Djokovic at the International Premier Tennis League (IPTL) match in New Delhi on December 8, 2014. AFP PHOTO/SAJJAD HUSSAIN. (Photo credit should read SAJJAD HUSSAIN/AFP/Getty Images)

Switzerland's Roger Federer waves to the crowd at the end of his Men's single tennis match against Serbia's Novak Djokovic at the International Premier Tennis League (IPTL) match in New Delhi on December 8, 2014. AFP PHOTO/SAJJAD HUSSAIN.        (Photo credit should read SAJJAD HUSSAIN/AFP/Getty Images)