Clouds hang over Busch Stadium as the St. Louis Cardinals play the New York Mets during the third inning of a baseball game Monday, May 3, 2021, in St. Louis. (AP Photo/Jeff Roberson)

Fans watch a baseball game between the St. Louis Cardinals and the Pittsburgh Pirates Tuesday, May 18, 2021, in St. Louis. The Cardinals have significantly loosened their COVID-19 guidelines, saying fully vaccinated fans attending games at Busch Stadium will no longer be required to wear masks inside the ballpark. (AP Photo/Jeff Roberson)