After the Red Sox's Opening Day loss to the Orioles, I read this in the Washington Post regarding Baltimore starter John Means (7-1-0-0-5, 97):
The last pitcher to strike out five or more batters while allowing one or fewer hits in seven or more innings on Opening Day was Boston Beaneaters starter Irv Young in 1906, according to Baseball Reference's Stathead service.
I hadn't even finished reading the sentence when I was thinking "Wait a minute . . ."
Many baseball fans know that on Opening Day in 1940, Feller pitched a no-hitter against the White Sox (9-0-0-5-8).