Novak Djokovic is 37 and was forced to stop playing because of an injury at two of the past four Grand Slam tournaments.

Alexander Zverev of Germany reacts after winning the first set during his semifinal match against Novak Djokovic of Serbia at the Australian Open tennis championship in Melbourne, Australia ...

Novak Djokovic’s Australian Open journey came to a premature end as an injury forced him to withdraw from the semi-final. The tennis legend has hinted at the possibility of retirement, depending on how the season unfolds.

3 seed Carlos Alcaraz and 10-time champion Novak Djokovic will renew their rivalry ... In other fourth-round action, No. 2 Alexander Zverev of Germany ripped 19 aces and defeated 14th-seeded ...

World number two Alex Zverev credited his brother Mischa for his mastery of left-handers after beating a 26th in succession in Frenchman Ugo Humbert to reach the Australian Open quarter-finals on Sunday. Zverev honed his game with left-handed Mischa, a former top-30 player who reached the quarter-finals at Melbourne Park in 2017.

Novak Djokovic and Aryna Sabalenka will step up their bids for ... Second seed Alexander Zverev of Germany is seeking a maiden Grand Slam title and has enjoyed two days off since his straight-sets win on Sunday night against Lucas Pouille.

Novak Djokovic retired mid-game during his semi-final clash with Alexander Zverev, who'll now face world No.1 Jannik Sinner in the Australian Open final on Sunday

Novak Djokovic's bid for 11th Australian Open title ends after a muscle tear in his left leg. He says injury happened during match vs. Carlos Alcaraz.

While tennis fans know who Novak Djokovic is, not many realize he married his highschool sweetheart after they began dating since 2005.

A tennis master is forced to depart an Australian Open semifinal with an injury, riling some in the crowd. At 37, it may be harder than ever to bounce back.

Djokovic is out of the Australian Open after retiring from his semi-final, with Zverev through to face Sinner on Sunday