Novak Djokovic withdraws from ATP Finals due to injury

(Photo credit: Robert Deutsch-Imagn Images)
Novak Djokovic ended his defense of his ATP Finals title before it began by withdrawing from the tournament on Tuesday due to an unspecified injury.

Djokovic, 37, also pulled out of last week's Paris Masters.

"I was really looking forward to being there, but due to ongoing injury I won't be playing next week," Djokovic wrote Tuesday on Instagram. "Apologies to those who were p