Jannik Sinner and Iga Swiatek doping scandals are 'disgusting', claims Nick Kyrgios - as he hits out at the pair and claims the integrity of tennis is under threat

Nick Kyrgios has launched a bitter attack on the sport's authorities, branding the doping cases involving Grand Slam winners Jannik Sinner and Iga Swiatek as 'disgusting' for the game.