Djokovic missing U.S. Open over COVID vaccine status would be 'a joke' - McEnroe

Four-times U.S. Open winner John McEnroe said it would be 'a joke' if Novak Djokovic is unable to compete at the U.S. tournament starting later this month due to his COVID-19 vaccination status. Djokovic has refused to take the vaccine and appears set to miss out on the year's last Grand Slam due to current U.S. rules that require travellers to show proof of full vaccination to board flights to and enter the United States.