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 on Sunday without any of the Big Three for the first time in 23 years. The top-ranked Sinner and No.

Citing an unspecified, "ongoing injury," Novak Djokovic announced his withdrawal from the season-ending ATP Finals on Tuesday.