John Franklin "Home Run" Baker was an American professional baseball player. A third baseman, Baker played in Major League Baseball from 1908 to 1922 for the Philadelphia Athletics and New York Yankees. Although he never hit more than 12 home runs in a season and hit only 96 in his major league career, Baker has been called the "original home run king of the majors".

A third baseman, abbreviated 3B, is the player in baseball or softball whose responsibility is to defend the area nearest to third base — the third of four bases a baserunner must touch in succession to score a run. In the scoring system used to record defensive plays, the third baseman is assigned the number 5.