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.
Djokovic, who won his first Olympic gold medal at the Paris Games in August, won last year's ATP Finals title by defeating twice major winner Jannik Sinner in the final.
"I was really looking forward to being there, but due to ongoing injury I won't be playing next week," Djokovic posted on his Instagram Story.
"Apologies to those who were planning to see me. Wishing all the players a great tournament. See you soon!"
Sinner, Zverev, four-times Grand Slam winner Carlos Alcaraz, former US Open champion Daniil Medvedev and American Taylor Fritz have booked their spots at the ATP Finals, which will be held from November 10-17 in Turin, Italy.

PSG sign Spain forward Torres from Barcelona
Spain's Perez sets women's half marathon race walk world record
Atletico Madrid sign Spurs captain Cristian Romero
Consortium including Amazon's Bezos to buy minority stake in Liverpool
Tanzid century stuns Australia, keeps Bangladesh on top in Darwin
