The term FIRST BASEMAN refers to a position in baseball. The job of the first baseman is to catch throws from other players, field ground balls, and make plays at first base. The answer to the crossword for WHO is Gehrig, referring to Lou Gehrig, an American professional baseball first baseman who played his entire career for the New York Yankees from 1923 to 1939. He was inducted into the Baseball Hall of Fame in 1939 and was widely regarded as one of the greatest players in baseball history.