MELBOURNE, AUSTRALIA - JANUARY 11: Novak Djokovic speaks to the media during an ASICS Brand Ambassador Announcement on Batman Avenue Bridge on January 11, 2018 in Melbourne, Australia. (Photo by Darrian Traynor/Getty Images)
MELBOURNE, AUSTRALIA - JANUARY 11: Novak Djokovic speaks to the media during an ASICS Brand Ambassador Announcement on Batman Avenue Bridge on January 11, 2018 in Melbourne, Australia. (Photo by Darrian Traynor/Getty Images)