Casper Ruud says he is not stating that Jannik Sinner is better than Novak Djokovic but suggests that he is more "terrified" of the Italian because at least he can stay in rallies with the Serb.

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.”