Djokovic Missing US Open Over COVID-19 Vaccine Status Would Be ‘A Joke’: McEnroe

Former U.S. tennis player John McEnroe (L) interviews Serbia's Novak Djokovic after his victory against Germany's Jan-Lennard Struff in their men's singles match on day one of the Australian Open tennis tournament in Melbourne on Jan. 20, 2020. William West/AFP via Getty Images

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 not taken the vaccine and appears set to miss out on the year’s last Grand Slam due to current U.S. rules that require travelers to show proof of full vaccination to board flights to and enter the United States.