A cranky right elbow forced Novak Djokovic to pull the plug on his season.
The injury hasn't slowed Djokovic's roll.
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The former No. 1 looks as fast as ever in a new lateral agility footwork drill he posted on Instagram.
"Morning workouts by the river," Djokovic captioned the video taken during training in his hometown of Belgrade.
The 12-time Grand Slam champion, who has been pained by the elbow issue for about 18 months, is aiming to return the pro circuit in 2018 and plans to continue working with new coach Andre Agassi.
Photo credit: Novak Djokovic