MELBOURNE, AUSTRALIA - JANUARY 30: Novak Djokovic of Serbia and coach Boris Becker during day 13 of the 2016 Australian Open at Melbourne Park on January 30, 2016 in Melbourne, Australia. (Photo by Cameron Spencer/Getty Images)
MELBOURNE, AUSTRALIA - JANUARY 30: Novak Djokovic of Serbia and coach Boris Becker during day 13 of the 2016 Australian Open at Melbourne Park on January 30, 2016 in Melbourne, Australia. (Photo by Cameron Spencer/Getty Images)