Russia’s Andrey Rublev said late Sunday he has tested positive for the coronavirus, making him the sixth player from a recent exhibition tournament in Abu Dhabi to contract the Sars-CoV-2 virus. The positive test keeps him out of the ATP Cup starting on Saturday in Sydney, where Russia are the defending champions. It also makes him doubtful for the Australian Open from January 17. Former world number one Rafael Nadal, Denis Shapovalov, US Open champion Emma Raducanu, Olympic champion Belinda Bencic and Ons Jabeur also tested positive in Abu Dhabi or after the event there. “I am currently in Ba…