Novak Djokovic is 37 and was forced to stop playing because of an injury at two of the past four Grand Slam tournaments.
Novak Djokovic retired injured after losing the first set 7-6(5) against Alex Zverev on Friday to put the German through to ...
Djokovic is only interested in tennis' biggest prizes. He still has the game to win them, but at age 37 his body is letting ...