Is this fact or fiction about Novak Djokovic?

Novak Djokovic is not only a tennis superstar, but a prolific prankster and all-round entertainer. So figuring out if the following statements are fact or fiction may prove pretty difficult! But have a go...

Created By Eurosport
On Oct 30, 2015
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Djokovic once admitted via his Instagram page that he mistook David Beckham for Robbie Williams.