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 of Serbia reacts at a press conference after retiring in his semifinal match against Alexander Zverev of ...

Spectators booed an injured Novak Djokovic as he left the court in Rod Laver Arena after quitting one set into his Australian ...

Novak Djokovic of Serbia shakes hands with chair umpire James Keothavong after retiring from his semifinal against Alexander Zverev of Germany at the Australian Open tennis championship in ...

Novak Djokovic vs Alexander Zverev ... He left the court to a mixture of boos and applause from the crowd as Germany’s Zverev ...

Andy Murray is determined to improve as a coach after his first grand slam experience with Novak Djokovic. Whether the pair ...

Serbia’s Novak Djokovic (R) embraces Germany’s Alexander Zverev after retiring from the men’s singles semifinal on day ...

Use extra caution. && Novak Djokovic of Serbia reacts at a press conference after retiring in his semifinal match against Alexander Zverev of Germany at the Australian Open tennis championship in ...

Serbian tennis icon Novak Djokovic revealed that he had suffered an unspecified muscle tear which caused him to end his journey in the tournament on a heartbreaking note. Germany's Alexander ...

Novak Djokovic and Andy Murray haven't decided whether ... Friday after losing the first set to No. 2 Alexander Zverev of Germany in a tiebreaker. Both Djokovic and Murray, a three-time Grand ...

Facing Sinner, particularly on hard courts, reminded Zverev a lot of trying to solve the challenge presented by none other than 24-time major champion Novak Djokovic.