Willie McGee was traded to the Oakland A’s in 1990, but he had already accumulated 542 plate appearances in the National League, enough for him to qualify for the National League batting crown. He left the Cardinals with a .335 batting average, which Los Angeles’ Eddie Murray (.330), the New York’s Dave Magadan (.328) were unable to catch.
Thus, Willie became the first player in Major League history to lead a lead in batting average, even though he played in the other league.
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