Novak Djokovic is living it up these days as the reigning US Open and Wimbledon champion. He's laid to rest all the doubts about his ability to return to the top and sits at No. 3 in the world, behind his usual rivals Rafael Nadal and Roger Federer.

As he awaits the start of his next challenge in Shanghai, Djokovic has kept busy.

He practiced "The Floss" dance with a young prodigy, Mihailo Topic.

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And reconnected with his roots by spending time with his mentor Niki Pilic.

And had a little fun with Albert Einstein on his way to Shanghai.

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He also made time for some carrot cake.

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Djokovic has qualified for the ATP Finals in London, but Shanghai will have valuable ranking points as he has none to defend from last year.