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World number Novak Djokovic has withdrawn from Serbia’s ATP Cup team. There remains uncertainty over whether the 34-year-old will compete at the Australian Open, which begins in Melbourne on January 17. All players and staff at the 2022 Australian Open must be vaccinated or have a medical exemption granted by an independent panel of experts. However, defending champion Djokovic has not spoken publicly about his vaccination status. The nine-time Australian Open winner has been replaced by world number 33 Dusan Lajovic for Serbia in the 16-country ATP Cup, which begins in Sydney on Saturday. Austria have been replaced by France…