MELBOURNE, AUSTRALIA - JANUARY 29: Rafael Nadal of Spain congratulates Roger Federer of Switzerland on winning their Men's Final as Roger Federer holds the Norman Brookes Challenge Cup match on day 14 of the 2017 Australian Open at Melbourne Park on January 29, 2017 in Melbourne, Australia. (Photo by Scott Barbour/Getty Images)

MELBOURNE, AUSTRALIA - JANUARY 29:  Rafael Nadal of Spain congratulates Roger Federer of Switzerland on winning their Men's Final as Roger Federer holds the Norman Brookes Challenge Cup match on day 14 of the 2017 Australian Open at Melbourne Park on January 29, 2017 in Melbourne, Australia. (Photo by Scott Barbour/Getty Images)