Novak Djokovic has retired from his Australian Open semifinal against Alexander Zverev after losing the first set in a tiebreak. Djokovic missed a regulation putaway volley on top of the net down 5-6,

Novak Djokovic’s quest for a record 25th grand slam title has been cut short at the Australian Open after he stunningly retired from his semifinal match due to a left leg injury.

When it comes to effort on the tennis court, few players can compare to the legendary Jimmy Connors. The eight-time Grand Slam champion built a reputation for being one of the most hard-working players on the ATP Tour.

Novak Djokovic remains one of the best tennis competitors today. At the age of 37, we have yet to see a decline in the Serbian star’s level of performance.

Facing Sinner reminded Alexander Zverev of trying to solve the challenge presented by the 24-time major champion Djokovic.

Zverev will face defending Australian Open champion and No. 1 seed Jannik Sinner, who beat American Ben Shelton 7-6 (2), 6-2, 6-2, in Sunday's final. Zverev is pursuing his first major tournament title.

Novak Djokovic has been defended by Serbia's Davis Cup captain as he called for an Australian broadcaster to be fired.

Novak Djokovic was booed off court after his Australian Open semi-final was cut short due to injury, and his Davis Cup captain issued a passionate defense.