Djokovic hits indescribable training shot

World tennis No.1 Novak Djokovic has been filmed hitting a stunning, almost indescribable shot.

The Serb was practicing in Belgrade when he hit a routine forehand and was too rushed to re-position himself for the second shot.

So while in position for a forehand, he hit a no-look, behind-the-back shot that also saw him pirouette on his right foot as he connected with the ball.

Surprised at his own brilliance, Djokovic let out a roar before chest bumping his training partner.

Video of the incredible shot was uploaded to YouTube where it has been seen 300,000 times in the last three days.