On the fictional St. Louis Wolves team in Abbott and Costello's famed routine, the third baseman's name is I Don't Know, which is appropriate because, for large stretches of baseball history, teams have tried, often without success, to find a quality third baseman. And yet, in 2025, it appears the search has shifted across the diamond. For one of the few times in major league history, we're asking, Who's on First?
First base is a position in flux. In 2024, major league first basemen batted .246, their lowest total since 1900. They also posted an OPS of .