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,

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

And just as Djokovic had a couple of hurdles by the names of Roger Federer and Rafael Nadal to deal with, Sinner is not alone among the newest generation of tennis stars. His top rival at this point is Carlos Alcaraz, who has four Slam victories at age 21 — and won all three matches he played against Sinner in 2024.

Novak Djokovic wrote a heartfelt message to Alexander Zverev on Instagram after his injury retirement in the Australian Open.

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.

Injured Djokovic decides not to continue after losing first set as Zverev reaches his first Australian Open final

Alexander Zverev compared the Italian to the Serb, but the ATP No.1 made it clear that Nole was practically unbeatable, when in top form

Alexander Zverev urges fans not to boo Novak Djokovic, who retired in the Australian Open Semifinals due to injury

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

Alexander Zverev said that Jannik Sinner is as good as Novak Djokovic at his peak and on "a different universe" after the German was well beaten in Sunday's Australian Open final.