The Boston Red Sox stand for the national anthem before an Opening Day game against Baltimore on Friday at Fenway Park in Boston.

Members of the Red Sox health compliance crew stand at the entrance to Fenway Park before Friday's game in Boston.

Socially distanced fans sit in the bleachers during the fifth inning of Boston's Opening Day game against Baltimore on Friday at Fenway Park in Boston.

Acting Mayor of Boston Kim Janey reacts after throwing out Friday at Fenway Park.

TJ Gonick, of Nutley, N.J., plays catch outside Fenway Park before Friday's Opening Day game between the Red Sox and Orioles.

Boston Manager Alex Cora, right, hugs Baltimore Manager Brandon Hyde before Friday's game.

Fans wear protective face masks during the sixth inning of Friday's game in Boston.

Acting Mayor of Boston Kim Janey, right, poses for a selfie outside Fenway Park before Friday's Opening Day game between the Red Sox and Orioles.

A Red Sox employee wears a protective mask at an entrance to Fenway Park on Friday in Boston.

Baltimore starter John Means delivers a pitch in the first inning against the Red Sox.

The Red Sox stand during a rendition of Amazing Grace before an Opening Day game against the Baltimore Orioles.