Novak Djokovic was booed off court by some Australian Open fans after retiring injured from his semi-final against Alexander Zverev.

Djokovic, who was bidding for a record-extending 11th title, quit after losing the first set 7-6 (7-5) in 80 minutes.

The 37-year-old Serb had his upper left leg heavily taped after injuring it in Tuesday’s quarter-final win over Carlos Alcaraz.

“I did everything I possibly could do to manage the muscle tear that I had,” said Djokovic, who was also aiming for an all-time standalone record of 25 major titles.

“Towards the end of that first set I just started feeling more and more pain.

“It was too much to handle for me.”

After he slapped a volley into the net on set point, seventh seed Djokovic immediately approached Zverev and shook his hand.

He waved to the crowd and gave them a double thumbs up, despite audible boos from some sections inside Rod Laver Arena.

“I knew even if I won the first set, that it’s going to be a huge uphill battle for me to stay physically fit enough to stay with him in the rallies for two, three, four hours,” added Djokovic.

“I don’t think I had that today in the tank.”

German second seed Zverev is still bidding for his first Grand Slam title after twice losing in major finals.

He will face either Italian top seed Jannik Sinner or American 21st seed Ben Shelton in Sunday’s final.