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)

Philadelphia Phillies' Nick Maton, right, scores past Miami Marlins catcher Sandy Leon on a single by Jean Segura during the eighth inning of a baseball game, Tuesday, May 18, 2021, in Philadelphia. (AP Photo/Matt Slocum)

Linesman Bryan Pancich, left, pushes away St. Louis Blues left wing Kyle Clifford after he tangled with Colorado Avalanche goaltender Philipp Grubauer as time ran out in Game 1 of an NHL hockey Stanley Cup first-round playoff series Monday, May 17, 2021, in Denver. Colorado won 4-1. (AP Photo/David Zalubowski)

St. Louis Blues center Brayden Schenn, right, jumps in the air to avoid a shot as Colorado Avalanche goaltender Philipp Grubauer covers the net in the third period of Game 1 of an NHL hockey Stanley Cup first-round playoff series Monday, May 17, 2021, in Denver. Colorado won 4-1. (AP Photo/David Zalubowski)