Tennis bad boy Nick Kyrgios has labelled world No. 1 Novak Djokovic a 'tool' and insulted fellow Aussie star Bernard Tomic's girlfriend in an astonishing jab at the Australian Open's hotel quarantine chaos. Vanessa Sierra had earlier offered an inside glimpse into her Melbourne hotel quarantine stint with Bernard Tomic Djokovic was roasted by Australian political leaders and tennis fans …
