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,

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 could not chase his 11th Australian Open title this week. The 37-year-old experienced a torn muscle in his left thigh in the quarter-final against Carlos Alcaraz and retired after losing the opening set of the semi-final clash with Alexander Zverev.