Djokovic has played in only two events since his disappointing third-round exit from the US Open. He reached the final of the Shanghai Masters but was defeated by Jannik Sinner, before losing against the Italian again in the Six Kings Slam.

For more than a decade, men's tennis has been dominated by the 'Big Three' — Roger Federer, Rafael Nadal and Novak Djokovic. However following the news that Djokovic will miss this year's ATP Finals — which begins on November 10 in Turin —with injury,

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.”