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.

Novak Djokovic won't defend his ATP Finals title after ruling himself out Tuesday citing an injury, leaving the season-ending event without a member of the Big Three of men's tennis for the first time in 23 years.

The seven-time ATP Finals champion Novak Djokovic will not compete in Turin next week, skipping the premium ATP event. Unlike the veteran, last year's finalist Jannik Sinner is eager to embrace battles against the world's best players,