The National League officially began recognizing a Player of the Month on June 4, 1958. Warren Giles polled baseball writers and broadcasters from each Major League city then announced the winner and awarded them with an engraved desk set.
The American League began honoring a Player of the Month Award in 1974. Neither league split the award in any fashion until the National League began honoring a Pitcher of the Month Award in 1975 followed by the American League Pitcher of the Month Award in 1979.
"We are a game of tradition. The right kind of tradition has made baseball what it is, but blindly following tradition may lead into a rutn. Baseball must keep pace with the times." - Warren Files (1969)