Novak Djokovic, the 21-time major champion and former world No. 1, has withdrawn from the US Open due to travel restrictions into the United States as a result of being unvaccinated against COVID-19.

Djokovic made the announcement Thursday morning, shortly before the draw was to be revealed, tweeting, "Sadly, I will not be able to travel to NY this time for US Open."

He wished luck to his fellow players and said he would "keep in good shape and positive spirit and wait for an opportunity to compete again.''