是的。德约由于没有（打2针）疫苗证书无法入境美国参加美网。当地时间本周四美网抽签，下周一，美网开赛，最迟周日入境美国。

The US Centers for Disease Control and Prevention (CDC), which is the nation's health protection agency, demands a non-US citizen must "show proof of being fully vaccinated against Covid-19" before travelling by air from a foreign country.

没疫苗证书者不可以坐飞机从机场入境美国。暗示可以坐轮船入境美国，也可以开车从加拿大或墨西哥入境美国。没疫苗证书者也不可以坐飞机从机场入境加拿大，所以无法开车从加拿大入境美国。不知道墨西哥的入境政策如何？

https://www.forbes.com/sites/adamzagoria/2022/08/23/novak-djokovic-will-miss-the-us-open-his-official-schedule-says/?sh=5d5af203043f
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