Novak Djokovic is the most successful player in the history of the ATP Finals when it comes to title wins, but he will not be defending his crown in 2024.

BELGRADE, Serbia (AP) — Novak Djokovic won’t defend his ATP Finals title after ruling himself out on Tuesday due to an unspecified injury. Djokovic wrote in an Instagram story, “I was really looking forward to being there, but due to ongoing injury I won’t be playing next week. Apologies to those who were planning to see me.”

Jannik Sinner and Carlos Alcaraz are poised to add another entry into their rapidly developing rivalry when the ATP Finals open Sunday without any members of the Big Three for the first time in nearly a quarter century.

Djokovic has won the ATP Finals, which is the end of year tournament somewhat seen as a fifth major, a record seven times. He won the title last year, beating current World No. 1 Jannik Sinner.

Novak Djokovic has pulled out of the season-ending ATP Finals due to an injury, the record 24-times Grand Slam champion said on Tuesday.The 37-year-old Serbian also withdrew from the Paris Masters, which was won by world number two Alexander Zverev on Sunday.

Jannick Sinner and Carlos Alcaraz have top billing at the season-ending ATP Finals in Turin. Here's how the best men's tennis players in the world qualified for the showpiece.