Willie Lee McCovey, nicknamed "Stretch", "Mac" and "Willie Mac", was an American professional baseball player. He played in Major League Baseball as a first baseman from 1959 to 1980, most notably as a member of the San Francisco Giants for whom he played for 19 seasons. McCovey also played for the San Diego Padres and Oakland Athletics in the latter part of his MLB career.

A first baseman, abbreviated 1B, is the player on a baseball or softball team who fields the area nearest first base, the first of four bases a baserunner must touch in succession to score a run. The first baseman is responsible for the majority of plays made at that base. In the numbering system used to record defensive plays, the first baseman is assigned the number 3.