This article is part of the Know Your Orioles 40-man series, which features an article about each of the 38 players currently on the Orioles roster. There will be one every weekday until we run out of players.
Whatever may lie ahead for Isaac Mattson’s big league career, he can always say his MLB debut was, well, unique.
The date was May 7, 2021, on a chilly evening in Baltimore, when the then-25-year-old Mattson completed his warmup tosses in the Orioles’ center field bullpen at Camden Yards. As the game entered the top of the ninth inning with the O’s trailing the Red Sox, the bullpen doors swung open.