Toni Nadal addressed the crowd's reaction, acknowledging their disappointment. The Spaniard called it understandable after they paid for tickets to witness a thrilling clash between two of the world's best players.

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

Rafael Nadal's former coach says there's been “mistrust” surrounding the injured Djokovic’s physical condition long before fans lashed out in Melbourne.

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.

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,

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.

What promised to be the next chapter in a phenomenal rivalry was overcome by strangeness on Rod Laver Arena in Melbourne

An injured Novak Djokovic retired from the Australian Open after dropping the first set of his semifinal against Alexander Zverev.

Top seed Novak Djokovic ends his campaign at Australian open following an injury in the semi-final match against Alexander Zverev in Melbour..|News Track

Alexander Zverev chided the crowd after they booed Novak Djokovic for retiring due to injury after the first set in an Australian Open semifinal.

Today in Sports, January 27 - N. Djokovic becomes 1st man in Open Era to win 3 straight Australian Open titles

I saw Carlos was hesitant a little bit…so I started to take my chances,” said the 37-year-old after his four-set quarterfinal victory.