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World number one Novak Djokovic has been entered into the Australian Open despite uncertainty over his Covid vaccination status, while seven-time winner Serena Williams is absent. Defending champion Djokovic has refused to reveal if he has been vaccinated – a requirement to play in Melbourne. Williams, 40, said she was not fit to compete at 2022’s first Grand Slam. Great Britain’s US Open champion Emma Raducanu, ranked 14th in the world, will make her tournament debut. Fellow Britons Cameron Norrie, Dan Evans and Heather Watson are also on the entry list. Twenty-time Grand Slam winner Roger Federer is absent while…