In a stunning development at the Australian Open, Novak Djokovic withdrew because of injury after losing the first set of his semifinal match versus Alexander Zverev. Zverev, the No. 2 seed, won a grueling first set in a 7–6 tiebreaker that lasted one hour and 26 minutes.

Djokovic, who retired due to injury after the first set, was booed by the crowd as he walked off Rod Laver Arena.

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.

Novak Djokovic is out of the Australian Open in stunning fashion. The 24-time slam champion medically retired immediately after dropping the first set of his semifinal match against No. 2 Alexander Zverev in a tiebreak 7-6 (5).

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 surprised everyone when he retired due to injury after the first set of his match against Alexander Zverev, and surprisingly, some of the Open crowd booed. Maybe fans felt like they weren’t getting their money’s worth.

Listen to the Australian Open on 5 Sports Extra and BBC Sounds and follow on the BBC Sport Website Andrea Petkovic, Ryan Harrison and Annabel Croft are guests across the programme. Tennis Correspondent Russell Fuller, along with Gigi Salmon and Annabel Croft are commentating live from the Rod Laver Arena.

Follow Novak Djokovic vs Alexander Zverev on BBC Sport Website/app and listen to Jannik Sinner vs Ben Shelton on 5 Sports Extra and BBC Sounds

Novak Djokovic drops a big update on his rumoured retirement after his emotional loss in the Australian Open semi-final.As per BBC, Djokovic’s goal of winning his 11th championship and 25th Grand Slam title came to an unexpected end

Retiring Novak Djokovic booed as Jannik Sinner to face Alexander Zverev in Australian Open final - live - Djokovic is out of the Australian Open after retiring from his semi-final, with Zverev through

Novak Djokovic was subject to boos from some fans after he was forced to retire injured from his Australian Open semifinal clash against Alexander Zverev. Djokovic, who is aiming to capture a record-extending 11th title at Melbourne Park,