Djokovic is only interested in tennis' biggest prizes. He still has the game to win them, but at age 37 his body is letting him down

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 has reacted to the crowd at the Australian Open booing after he decided to retire from his semifinal against Alexander Zverev. The Serbian tennis player, 37, had taken to the court with his left leg heavily taped following Tuesday’s injury.

Andy Murray is determined to improve as a coach after his first grand slam experience with Novak Djokovic. Whether the pair will continue to work together remains to be seen but the experience appears to have whetted the Scot’s appetite.

Andy Murray has told tennis coaches that it's far harder playing the sport than watching on from the sidelines after working with Novak Djokovic at the Australian Open. Djokovic made the semi-finals of the competition this winter but was forced to withdraw from his showdown with Alexander Zverev on Friday due to injury.