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"Novak Djokovic is nicknamed 'the Djoker', but it was Star Wars antagonist Darth Vader who he turned up as ahead of his match with Sam Querrey at the ATP ..."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.huffingtonpost.co.uk/2012/11/01/novak-djokovic-darth-vader_n_2056564.html>