Serbian tennis star Novak Djokovic has crashed out of the Brisbane International after suffering a shock defeat against American Reilly Opelka in the quarter-final. In his pursuit of the 100th ATP title, Novak Djokovic lost to Reilly Opelka, who has been one of the stories on the tour over the past few months, with a scoreline of 7-6(8-6), 6-3.