The U.S. Tennis Associated (USTA) changed its policy on COVID-19 vaccines for the 2021 U.S. Open months after tickets went on sale and previously stating unvaccinated fans are allowed to watch the two-week Grand Slam tournament in New York. Just days before the main draw is set to begin, the USTA announced in a statement they have been informed by the New York City mayor’s office that proof-of-vaccination documents will be required to enter Arthur Ashe Stadium, the main arena at the National Tennis Center. “Given the continuing evolution of the Delta variant and in keeping with our intention to put the health and safety of our fans first, the USTA will extend the Mayor’s requirement to all U.S. Open ticket holders 12-years-old and older,” the USTA statement reads. “Any U.S. Open attendee with tickets to Arthur Ashe Stadium, Louis Armstrong Stadium, The Grandstand, or the grounds of the US Open, …