Marcus Elmore "Mark" Baldwin (October 29, 1863 – November 10, 1929), nicknamed "Fido", was an American right-handed professional baseball pitcher who played seven seasons in Major League Baseball (MLB). Born in Pittsburgh, Pennsylvania, Baldwin made his professional debut for a Cumberland, Maryland team in 1883. Though signed by Chicago White Stockings President Albert Spalding to pitch in the 1886 World Series, Baldwin did not play after the St. Louis Browns, against whom Chicago played, objected. He made his MLB debut for the White Stockings in 1887, during which year a writer for the Oshkosh Daily Northwestern called him the "swiftest pitcher in the National League" (NL). Released by Chicago player–manager Cap Anson, he signed with the Columbus Solons of the American Association (AA) in