Bob Costas was left saying "Sorry" while working the Yankees vs. Guardians game ... after he accidentally called Cleveland pitcher Shane Bieber "Justin Bieber" -- and the moment is hysterical.
The legendary broadcaster made the mistake during the top of the 6th inning of Game 2 of the American League Division Series on Friday ... when he meant to talk about the 2020 Cy Young winner, but ended up name-dropping the pop star.
"Justin Bieber just threw his 84th pitch," Costas said before immediately realizing his mistake.